debug: [vmagent] add debug log for max_scrape_size

docs/CHANGELOG.md: cut v1.103.0
Signed-off-by: hagen1778 <roman@victoriametrics.com>
2026-05-19 17:56:32 +03:00 · 2025-02-11 22:27:54 +08:00 · 2024-08-28 13:48:31 +02:00 · 2024-08-28 13:47:29 +02:00 · 2024-08-28 13:30:38 +02:00 · 2024-08-28 13:00:30 +02:00
750 changed files with 16324 additions and 18482 deletions
--- a/.gitignore
+++ b/.gitignore
@@ -7,6 +7,7 @@
 .vscode
 *.test
 *.swp
+/vmdocs
 /gocache-for-docker
 /victoria-logs-data
 /victoria-metrics-data
--- a/40
+++ b/40
@@ -13,6 +13,7 @@ PKG_TAG := $(BUILDINFO_TAG)
 endif

 GO_BUILDINFO = -X '$(PKG_PREFIX)/lib/buildinfo.Version=$(APP_NAME)-$(DATEINFO_TAG)-$(BUILDINFO_TAG)'
+TAR_OWNERSHIP ?= --owner=1000 --group=1000

 .PHONY: $(MAKECMDGOALS)

@@ -245,7 +246,7 @@ release-victoria-metrics-windows-amd64:

 release-victoria-metrics-goos-goarch: victoria-metrics-$(GOOS)-$(GOARCH)-prod
 	cd bin && \
-		tar --transform="flags=r;s|-$(GOOS)-$(GOARCH)||" -czf victoria-metrics-$(GOOS)-$(GOARCH)-$(PKG_TAG).tar.gz \
+		tar $(TAR_OWNERSHIP) --transform="flags=r;s|-$(GOOS)-$(GOARCH)||" -czf victoria-metrics-$(GOOS)-$(GOARCH)-$(PKG_TAG).tar.gz \
 			victoria-metrics-$(GOOS)-$(GOARCH)-prod \
 		&& sha256sum victoria-metrics-$(GOOS)-$(GOARCH)-$(PKG_TAG).tar.gz \
 			victoria-metrics-$(GOOS)-$(GOARCH)-prod \
@@ -302,7 +303,7 @@ release-victoria-logs-windows-amd64:

 release-victoria-logs-goos-goarch: victoria-logs-$(GOOS)-$(GOARCH)-prod
 	cd bin && \
-		tar --transform="flags=r;s|-$(GOOS)-$(GOARCH)||" -czf victoria-logs-$(GOOS)-$(GOARCH)-$(PKG_TAG).tar.gz \
+		tar $(TAR_OWNERSHIP) --transform="flags=r;s|-$(GOOS)-$(GOARCH)||" -czf victoria-logs-$(GOOS)-$(GOARCH)-$(PKG_TAG).tar.gz \
 			victoria-logs-$(GOOS)-$(GOARCH)-prod \
 		&& sha256sum victoria-logs-$(GOOS)-$(GOARCH)-$(PKG_TAG).tar.gz \
 			victoria-logs-$(GOOS)-$(GOARCH)-prod \
@@ -366,7 +367,7 @@ release-vmutils-goos-goarch: \
 	vmrestore-$(GOOS)-$(GOARCH)-prod \
 	vmctl-$(GOOS)-$(GOARCH)-prod
 	cd bin && \
-		tar --transform="flags=r;s|-$(GOOS)-$(GOARCH)||" -czf vmutils-$(GOOS)-$(GOARCH)-$(PKG_TAG).tar.gz \
+		tar $(TAR_OWNERSHIP) --transform="flags=r;s|-$(GOOS)-$(GOARCH)||" -czf vmutils-$(GOOS)-$(GOARCH)-$(PKG_TAG).tar.gz \
 			vmagent-$(GOOS)-$(GOARCH)-prod \
 			vmalert-$(GOOS)-$(GOARCH)-prod \
 			vmalert-tool-$(GOOS)-$(GOARCH)-prod \
@@ -494,7 +495,7 @@ golangci-lint: install-golangci-lint
 	golangci-lint run

 install-golangci-lint:
-	which golangci-lint || curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b $(shell go env GOPATH)/bin v1.59.1
+	which golangci-lint || curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b $(shell go env GOPATH)/bin v1.60.1

 remove-golangci-lint:
 	rm -rf `which golangci-lint`
@@ -513,34 +514,3 @@ install-wwhrd:

 check-licenses: install-wwhrd
 	wwhrd check -f .wwhrd.yml
-
-copy-docs:
-# The 'printf' function is used instead of 'echo' or 'echo -e' to handle line breaks (e.g. '\n') in the same way on different operating systems (MacOS/Ubuntu Linux/Arch Linux) and their shells (bash/sh/zsh/fish).
-# For details, see https://github.com/VictoriaMetrics/VictoriaMetrics/pull/4548#issue-1782796419 and https://stackoverflow.com/questions/8467424/echo-newline-in-bash-prints-literal-n
-	echo "---" > ${DST}
-	@if [ ${ORDER} -ne 0 ]; then \
-		echo "sort: ${ORDER}" >> ${DST}; \
-		echo "weight: ${ORDER}" >> ${DST}; \
-		printf "menu:\n  docs:\n    parent: 'victoriametrics'\n    weight: ${ORDER}\n" >> ${DST}; \
-	fi
-
-	echo "title: ${TITLE}" >> ${DST}
-	@if [ ${OLD_URL} ]; then \
-		printf "aliases:\n  - ${OLD_URL}\n" >> ${DST}; \
-	fi
-	echo "---" >> ${DST}
-	cat ${SRC} >> ${DST}
-	sed -i='.tmp' 's/<img src=\"docs\//<img src=\"/' ${DST}
-	sed -i='.tmp' 's/<source srcset=\"docs\//<source srcset=\"/' ${DST}
-	rm -rf docs/*.tmp
-
-# Copies docs for all components and adds the order/weight tag, title, menu position and alias with the backward compatible link for the old site.
-# For ORDER=0 it adds no order tag/weight tag.
-# FOR OLD_URL - relative link, used for backward compatibility with the link from documentation based on GitHub pages (old one)
-# FOR OLD_URL='' it adds no alias, it should be empty for every new page, don't change it for already existing links.
-# Images starting with <img src="docs/ are replaced with <img src="
-# Cluster docs are supposed to be ordered as 2nd.
-# The rest of docs is ordered manually.
-docs-sync:
-	SRC=README.md DST=docs/README.md OLD_URL='' ORDER=0 TITLE=VictoriaMetrics $(MAKE) copy-docs
-	SRC=README.md DST=docs/Single-server-VictoriaMetrics.md OLD_URL='/Single-server-VictoriaMetrics.html' TITLE=VictoriaMetrics ORDER=1 $(MAKE) copy-docs
--- a/README.md
+++ b/README.md
--- a/SECURITY.md
+++ b/SECURITY.md
@@ -7,12 +7,12 @@ The following versions of VictoriaMetrics receive regular security fixes:
 | Version | Supported          |
 |---------|--------------------|
 | [latest release](https://docs.victoriametrics.com/changelog/) | :white_check_mark: |
+| v1.102.x [LTS line](https://docs.victoriametrics.com/lts-releases/) | :white_check_mark: |
 | v1.97.x [LTS line](https://docs.victoriametrics.com/lts-releases/) | :white_check_mark: |
-| v1.93.x [LTS line](https://docs.victoriametrics.com/lts-releases/) | :white_check_mark: |
 | other releases  | :x:                |

 See [this page](https://victoriametrics.com/security/) for more details.

 ## Reporting a Vulnerability

-Please report any security issues to security@victoriametrics.com
+Please report any security issues to <security@victoriametrics.com>
--- a/app/vlinsert/elasticsearch/elasticsearch.go
+++ b/app/vlinsert/elasticsearch/elasticsearch.go
@@ -57,6 +57,12 @@ func RequestHandler(path string, w http.ResponseWriter, r *http.Request) bool {
 		fmt.Fprintf(w, `{}`)
 		return true
 	}
+	if strings.HasPrefix(path, "/logstash") || strings.HasPrefix(path, "/_logstash") {
+		// Return fake response for Logstash APIs requests.
+		// See: https://www.elastic.co/guide/en/elasticsearch/reference/8.8/logstash-apis.html
+		fmt.Fprintf(w, `{}`)
+		return true
+	}
 	switch path {
 	case "/":
 		switch r.Method {
--- a/app/vlogsgenerator/main.go
+++ b/app/vlogsgenerator/main.go
@@ -230,7 +230,7 @@ func generateLogsAtTimestamp(bw *bufio.Writer, workerID int, ts int64, firstStre
 	for i := 0; i < activeStreams; i++ {
 		ip := toIPv4(rand.Uint32())
 		uuid := toUUID(rand.Uint64(), rand.Uint64())
-		fmt.Fprintf(bw, `{"_time":%q,"_msg":"message for the stream %d and worker %d; ip=%s; uuid=%s; u64=%d","host":"host_%d","worker_id":"%d"`,
+		fmt.Fprintf(bw, `{"_time":"%s","_msg":"message for the stream %d and worker %d; ip=%s; uuid=%s; u64=%d","host":"host_%d","worker_id":"%d"`,
 			timeStr, streamID, workerID, ip, uuid, rand.Uint64(), streamID, workerID)
 		fmt.Fprintf(bw, `,"run_id":"%s"`, runID)
 		for j := 0; j < *constFieldsPerLog; j++ {
--- a/app/vlselect/vmui/asset-manifest.json
+++ b/app/vlselect/vmui/asset-manifest.json
@@ -1,13 +1,13 @@
 {
  "files": {
-    "main.css": "./static/css/main.1041c3d4.css",
-    "main.js": "./static/js/main.62a82f4a.js",
+    "main.css": "./static/css/main.c9cc37dd.css",
+    "main.js": "./static/js/main.7ae2e2c4.js",
    "static/js/685.bebe1265.chunk.js": "./static/js/685.bebe1265.chunk.js",
-    "static/media/MetricsQL.md": "./static/media/MetricsQL.aaabf95f2c9bf356bde4.md",
+    "static/media/MetricsQL.md": "./static/media/MetricsQL.8c2e588d62b87f90dbf0.md",
    "index.html": "./index.html"
  },
  "entrypoints": [
-    "static/css/main.1041c3d4.css",
-    "static/js/main.62a82f4a.js"
+    "static/css/main.c9cc37dd.css",
+    "static/js/main.7ae2e2c4.js"
  ]
 }
--- a/app/vlselect/vmui/index.html
+++ b/app/vlselect/vmui/index.html
@@ -1 +1 @@
-<!doctype html><html lang="en"><head><meta charset="utf-8"/><link rel="icon" href="./favicon.ico"/><meta name="viewport" content="width=device-width,initial-scale=1,maximum-scale=5"/><meta name="theme-color" content="#000000"/><meta name="description" content="UI for VictoriaMetrics"/><link rel="apple-touch-icon" href="./apple-touch-icon.png"/><link rel="icon" type="image/png" sizes="32x32" href="./favicon-32x32.png"><link rel="manifest" href="./manifest.json"/><title>VM UI</title><script src="./dashboards/index.js" type="module"></script><meta name="twitter:card" content="summary_large_image"><meta name="twitter:image" content="./preview.jpg"><meta name="twitter:title" content="UI for VictoriaMetrics"><meta name="twitter:description" content="Explore and troubleshoot your VictoriaMetrics data"><meta name="twitter:site" content="@VictoriaMetrics"><meta property="og:title" content="Metric explorer for VictoriaMetrics"><meta property="og:description" content="Explore and troubleshoot your VictoriaMetrics data"><meta property="og:image" content="./preview.jpg"><meta property="og:type" content="website"><script defer="defer" src="./static/js/main.62a82f4a.js"></script><link href="./static/css/main.1041c3d4.css" rel="stylesheet"></head><body><noscript>You need to enable JavaScript to run this app.</noscript><div id="root"></div></body></html>
+<!doctype html><html lang="en"><head><meta charset="utf-8"/><link rel="icon" href="./favicon.ico"/><meta name="viewport" content="width=device-width,initial-scale=1,maximum-scale=5"/><meta name="theme-color" content="#000000"/><meta name="description" content="UI for VictoriaMetrics"/><link rel="apple-touch-icon" href="./apple-touch-icon.png"/><link rel="icon" type="image/png" sizes="32x32" href="./favicon-32x32.png"><link rel="manifest" href="./manifest.json"/><title>VM UI</title><meta name="twitter:card" content="summary_large_image"><meta name="twitter:image" content="./preview.jpg"><meta name="twitter:title" content="UI for VictoriaMetrics"><meta name="twitter:description" content="Explore and troubleshoot your VictoriaMetrics data"><meta name="twitter:site" content="@VictoriaMetrics"><meta property="og:title" content="Metric explorer for VictoriaMetrics"><meta property="og:description" content="Explore and troubleshoot your VictoriaMetrics data"><meta property="og:image" content="./preview.jpg"><meta property="og:type" content="website"><script defer="defer" src="./static/js/main.7ae2e2c4.js"></script><link href="./static/css/main.c9cc37dd.css" rel="stylesheet"></head><body><noscript>You need to enable JavaScript to run this app.</noscript><div id="root"></div></body></html>
--- a/app/vlselect/vmui/static/css/main.1041c3d4.css
+++ b/app/vlselect/vmui/static/css/main.1041c3d4.css
--- a/app/vlselect/vmui/static/css/main.c9cc37dd.css
+++ b/app/vlselect/vmui/static/css/main.c9cc37dd.css
--- a/app/vlselect/vmui/static/js/main.62a82f4a.js
+++ b/app/vlselect/vmui/static/js/main.62a82f4a.js
--- a/app/vlselect/vmui/static/js/main.7ae2e2c4.js
+++ b/app/vlselect/vmui/static/js/main.7ae2e2c4.js
--- a/app/vlselect/vmui/static/js/main.7ae2e2c4.js.LICENSE.txt
+++ b/app/vlselect/vmui/static/js/main.7ae2e2c4.js.LICENSE.txt
--- a/app/vlselect/vmui/static/media/MetricsQL.8c2e588d62b87f90dbf0.md
+++ b/app/vlselect/vmui/static/media/MetricsQL.8c2e588d62b87f90dbf0.md
@@ -1,5 +1,4 @@
 ---
-sort: 23
 weight: 23
 title: MetricsQL
 menu:
@@ -10,9 +9,6 @@ aliases:
 - /ExtendedPromQL.html
 - /MetricsQL.html
 ---
-
-# MetricsQL
-
 [VictoriaMetrics](https://github.com/VictoriaMetrics/VictoriaMetrics) implements MetricsQL -
 query language inspired by [PromQL](https://prometheus.io/docs/prometheus/latest/querying/basics/).
 MetricsQL is backwards-compatible with PromQL, so Grafana dashboards backed by Prometheus datasource should work
@@ -220,9 +216,11 @@ See also [descent_over_time](#descent_over_time).
 over [raw samples](https://docs.victoriametrics.com/keyconcepts/#raw-samples) on the given lookbehind window `d` per each time series returned
 from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering).

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 This function is supported by PromQL.

-See also [median_over_time](#median_over_time).
+See also [median_over_time](#median_over_time), [min_over_time](#min_over_time) and [max_over_time](#max_over_time).

 #### changes

@@ -262,6 +260,8 @@ from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#f

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 See also [count_over_time](#count_over_time), [share_eq_over_time](#share_eq_over_time) and [count_values_over_time](#count_values_over_time).

 #### count_gt_over_time
@@ -272,6 +272,8 @@ from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#f

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 See also [count_over_time](#count_over_time) and [share_gt_over_time](#share_gt_over_time).

 #### count_le_over_time
@@ -282,6 +284,8 @@ from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#f

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 See also [count_over_time](#count_over_time) and [share_le_over_time](#share_le_over_time).

 #### count_ne_over_time
@@ -292,7 +296,9 @@ from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#f

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

-See also [count_over_time](#count_over_time).
+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
+See also [count_over_time](#count_over_time) and [count_eq_over_time](#count_eq_over_time).

 #### count_over_time

@@ -313,6 +319,8 @@ The results are calculated independently per each time series returned from the

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 See also [count_eq_over_time](#count_eq_over_time), [count_values](#count_values) and [distinct_over_time](#distinct_over_time) and [label_match](#label_match).

 #### decreases_over_time
@@ -432,6 +440,8 @@ from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#f

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 #### histogram_over_time

 `histogram_over_time(series_selector[d])` is a [rollup function](#rollup-functions), which calculates
@@ -443,11 +453,15 @@ For example, the following query calculates median temperature by country over t

 `histogram_quantile(0.5, sum(histogram_over_time(temperature[24h])) by (vmrange,country))`.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 #### hoeffding_bound_lower

 `hoeffding_bound_lower(phi, series_selector[d])` is a [rollup function](#rollup-functions), which calculates
 lower [Hoeffding bound](https://en.wikipedia.org/wiki/Hoeffding%27s_inequality) for the given `phi` in the range `[0...1]`.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 See also [hoeffding_bound_upper](#hoeffding_bound_upper).

 #### hoeffding_bound_upper
@@ -455,6 +469,8 @@ See also [hoeffding_bound_upper](#hoeffding_bound_upper).
 `hoeffding_bound_upper(phi, series_selector[d])` is a [rollup function](#rollup-functions), which calculates
 upper [Hoeffding bound](https://en.wikipedia.org/wiki/Hoeffding%27s_inequality) for the given `phi` in the range `[0...1]`.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 See also [hoeffding_bound_lower](#hoeffding_bound_lower).

 #### holt_winters
@@ -462,8 +478,9 @@ See also [hoeffding_bound_lower](#hoeffding_bound_lower).
 `holt_winters(series_selector[d], sf, tf)` is a [rollup function](#rollup-functions), which calculates Holt-Winters value
 (aka [double exponential smoothing](https://en.wikipedia.org/wiki/Exponential_smoothing#Double_exponential_smoothing)) for [raw samples](https://docs.victoriametrics.com/keyconcepts/#raw-samples)
 over the given lookbehind window `d` using the given smoothing factor `sf` and the given trend factor `tf`.
-Both `sf` and `tf` must be in the range `[0...1]`. It is expected that the [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering)
-returns time series of [gauge type](https://docs.victoriametrics.com/keyconcepts/#gauge).
+Both `sf` and `tf` must be in the range `[0...1]`.
+
+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).

 This function is supported by PromQL.

@@ -495,13 +512,14 @@ See also [deriv](#deriv).

 `increase(series_selector[d])` is a [rollup function](#rollup-functions), which calculates the increase over the given lookbehind window `d`
 per each time series returned from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering).
-It is expected that the `series_selector` returns time series of [counter type](https://docs.victoriametrics.com/keyconcepts/#counter).

 Unlike Prometheus, it takes into account the last sample before the given lookbehind window `d` when calculating the result.
 See [this article](https://medium.com/@romanhavronenko/victoriametrics-promql-compliance-d4318203f51e) for details.

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [counters](https://docs.victoriametrics.com/keyconcepts/#counter).
+
 This function is supported by PromQL.

 See also [increase_pure](#increase_pure), [increase_prometheus](#increase_prometheus) and [delta](#delta).
@@ -510,12 +528,13 @@ See also [increase_pure](#increase_pure), [increase_prometheus](#increase_promet

 `increase_prometheus(series_selector[d])` is a [rollup function](#rollup-functions), which calculates the increase
 over the given lookbehind window `d` per each time series returned from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering).
-It is expected that the `series_selector` returns time series of [counter type](https://docs.victoriametrics.com/keyconcepts/#counter).
 It doesn't take into account the last sample before the given lookbehind window `d` when calculating the result in the same way as Prometheus does.
 See [this article](https://medium.com/@romanhavronenko/victoriametrics-promql-compliance-d4318203f51e) for details.

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [counters](https://docs.victoriametrics.com/keyconcepts/#counter).
+
 See also [increase_pure](#increase_pure) and [increase](#increase).

 #### increase_pure
@@ -524,6 +543,10 @@ See also [increase_pure](#increase_pure) and [increase](#increase).
 of the following corner case - it assumes that [counters](https://docs.victoriametrics.com/keyconcepts/#counter) always start from 0,
 while [increase](#increase) ignores the first value in a series if it is too big.

+This function is usually applied to [counters](https://docs.victoriametrics.com/keyconcepts/#counter).
+
+See also [increase](#increase) and [increase_prometheus](#increase_prometheus).
+
 #### increases_over_time

 `increases_over_time(series_selector[d])` is a [rollup function](#rollup-functions), which calculates the number of [raw sample](https://docs.victoriametrics.com/keyconcepts/#raw-samples)
@@ -540,15 +563,18 @@ on the given lookbehind window `d` per each time series returned from the given

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 #### irate

 `irate(series_selector[d])` is a [rollup function](#rollup-functions), which calculates the "instant" per-second increase rate over
 the last two [raw samples](https://docs.victoriametrics.com/keyconcepts/#raw-samples)
 on the given lookbehind window `d` per each time series returned from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering).
-It is expected that the `series_selector` returns time series of [counter type](https://docs.victoriametrics.com/keyconcepts/#counter).

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [counters](https://docs.victoriametrics.com/keyconcepts/#counter).
+
 This function is supported by PromQL.

 See also [rate](#rate) and [rollup_rate](#rollup_rate).
@@ -587,6 +613,8 @@ See also [duration_over_time](#duration_over_time) and [lag](#lag).
 over [raw samples](https://docs.victoriametrics.com/keyconcepts/#raw-samples) on the given lookbehind window `d` per each time series returned
 from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering).

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 See also [mad](#mad), [range_mad](#range_mad) and [outlier_iqr_over_time](#outlier_iqr_over_time).

 #### max_over_time
@@ -594,9 +622,11 @@ See also [mad](#mad), [range_mad](#range_mad) and [outlier_iqr_over_time](#outli
 `max_over_time(series_selector[d])` is a [rollup function](#rollup-functions), which calculates the maximum value over [raw samples](https://docs.victoriametrics.com/keyconcepts/#raw-samples)
 on the given lookbehind window `d` per each time series returned from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering).

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 This function is supported by PromQL.

-See also [tmax_over_time](#tmax_over_time).
+See also [tmax_over_time](#tmax_over_time) and [min_over_time](#min_over_time).

 #### median_over_time

@@ -604,6 +634,8 @@ See also [tmax_over_time](#tmax_over_time).
 on the given lookbehind window `d` per each time series returned
 from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering).

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 See also [avg_over_time](#avg_over_time).

 #### min_over_time
@@ -611,9 +643,11 @@ See also [avg_over_time](#avg_over_time).
 `min_over_time(series_selector[d])` is a [rollup function](#rollup-functions), which calculates the minimum value over [raw samples](https://docs.victoriametrics.com/keyconcepts/#raw-samples)
 on the given lookbehind window `d` per each time series returned from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering).

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 This function is supported by PromQL.

-See also [tmin_over_time](#tmin_over_time).
+See also [tmin_over_time](#tmin_over_time) and [max_over_time](#max_over_time).

 #### mode_over_time

@@ -622,6 +656,8 @@ for [raw samples](https://docs.victoriametrics.com/keyconcepts/#raw-samples) on
 from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering). It is expected that [raw sample](https://docs.victoriametrics.com/keyconcepts/#raw-samples)
 values are discrete.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 #### outlier_iqr_over_time

 `outlier_iqr_over_time(series_selector[d])` is a [rollup function](#rollup-functions), which returns the last sample on the given lookbehind window `d`
@@ -632,6 +668,8 @@ if its value is either smaller than the `q25-1.5*iqr` or bigger than `q75+1.5*iq
 The `outlier_iqr_over_time()` is useful for detecting anomalies in gauge values based on the previous history of values.
 For example, `outlier_iqr_over_time(memory_usage_bytes[1h])` triggers when `memory_usage_bytes` suddenly goes outside the usual value range for the last hour.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 See also [outliers_iqr](#outliers_iqr).

 #### predict_linear
@@ -659,6 +697,8 @@ This function is supported by PromQL.
 on the given lookbehind window `d` per each time series returned from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering).
 The `phi` value must be in the range `[0...1]`.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 This function is supported by PromQL.

 See also [quantiles_over_time](#quantiles_over_time).
@@ -670,6 +710,8 @@ over [raw samples](https://docs.victoriametrics.com/keyconcepts/#raw-samples) on
 from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering).
 The function returns individual series per each `phi*` with `{phiLabel="phi*"}` label. `phi*` values must be in the range `[0...1]`.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 See also [quantile_over_time](#quantile_over_time).

 #### range_over_time
@@ -680,11 +722,12 @@ E.g. it calculates `max_over_time(series_selector[d]) - min_over_time(series_sel

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 #### rate

 `rate(series_selector[d])` is a [rollup function](#rollup-functions), which calculates the average per-second increase rate
 over the given lookbehind window `d` per each time series returned from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering).
-It is expected that the `series_selector` returns time series of [counter type](https://docs.victoriametrics.com/keyconcepts/#counter).

 If the lookbehind window is skipped in square brackets, then it is automatically calculated as `max(step, scrape_interval)`, where `step` is the query arg value
 passed to [/api/v1/query_range](https://docs.victoriametrics.com/keyconcepts/#range-query) or [/api/v1/query](https://docs.victoriametrics.com/keyconcepts/#instant-query),
@@ -703,6 +746,8 @@ See also [irate](#irate) and [rollup_rate](#rollup_rate).
 on the given lookbehind window `d`. The calculations are performed individually per each time series returned
 from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering).

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

 #### resets
@@ -710,10 +755,11 @@ Metric names are stripped from the resulting rollups. Add [keep_metric_names](#k
 `resets(series_selector[d])` is a [rollup function](#rollup-functions), which returns the number
 of [counter](https://docs.victoriametrics.com/keyconcepts/#counter) resets over the given lookbehind window `d`
 per each time series returned from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering).
-It is expected that the `series_selector` returns time series of [counter type](https://docs.victoriametrics.com/keyconcepts/#counter).

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [counters](https://docs.victoriametrics.com/keyconcepts/#counter).
+
 This function is supported by PromQL.

 #### rollup
@@ -725,6 +771,10 @@ These values are calculated individually per each time series returned from the
 Optional 2nd argument `"min"`, `"max"` or `"avg"` can be passed to keep only one calculation result and without adding a label.
 See also [label_match](#label_match).

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
+See also [rollup_rate](#rollup_rate).
+
 #### rollup_candlestick

 `rollup_candlestick(series_selector[d])` is a [rollup function](#rollup-functions), which calculates `open`, `high`, `low` and `close` values (aka OHLC)
@@ -736,6 +786,8 @@ from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#f
 Optional 2nd argument `"open"`, `"high"` or `"low"` or `"close"` can be passed to keep only one calculation result and without adding a label.
 See also [label_match](#label_match).

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 #### rollup_delta

 `rollup_delta(series_selector[d])` is a [rollup function](#rollup-functions), which calculates differences between adjacent [raw samples](https://docs.victoriametrics.com/keyconcepts/#raw-samples)
@@ -762,6 +814,8 @@ See also [label_match](#label_match).

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+See also [rollup](#rollup) and [rollup_rate](#rollup_rate).
+
 #### rollup_increase

 `rollup_increase(series_selector[d])` is a [rollup function](#rollup-functions), which calculates increases for adjacent [raw samples](https://docs.victoriametrics.com/keyconcepts/#raw-samples)
@@ -774,12 +828,17 @@ See also [label_match](#label_match).

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names. See also [rollup_delta](#rollup_delta).

+This function is usually applied to [counters](https://docs.victoriametrics.com/keyconcepts/#counter).
+
+See also [rollup](#rollup) and [rollup_rate](#rollup_rate).
+
 #### rollup_rate

 `rollup_rate(series_selector[d])` is a [rollup function](#rollup-functions), which calculates per-second change rates
 for adjacent [raw samples](https://docs.victoriametrics.com/keyconcepts/#raw-samples)
 on the given lookbehind window `d` and returns `min`, `max` and `avg` values for the calculated per-second change rates
 and returns them in time series with `rollup="min"`, `rollup="max"` and `rollup="avg"` additional labels.
+The calculations are performed individually per each time series returned from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering).

 See [this article](https://valyala.medium.com/why-irate-from-prometheus-doesnt-capture-spikes-45f9896d7832) in order to understand better
 when to use `rollup_rate()`.
@@ -787,10 +846,12 @@ when to use `rollup_rate()`.
 Optional 2nd argument `"min"`, `"max"` or `"avg"` can be passed to keep only one calculation result and without adding a label.
 See also [label_match](#label_match).

-The calculations are performed individually per each time series returned from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering).
-
 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [counters](https://docs.victoriametrics.com/keyconcepts/#counter).
+
+See also [rollup](#rollup) and [rollup_increase](#rollup_increase).
+
 #### rollup_scrape_interval

 `rollup_scrape_interval(series_selector[d])` is a [rollup function](#rollup-functions), which calculates the interval in seconds between
@@ -824,6 +885,8 @@ This function is useful for calculating SLI and SLO. Example: `share_gt_over_tim

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 See also [share_le_over_time](#share_le_over_time) and [count_gt_over_time](#count_gt_over_time).

 #### share_le_over_time
@@ -838,6 +901,8 @@ the share of time series values for the last 24 hours when memory usage was belo

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 See also [share_gt_over_time](#share_gt_over_time) and [count_le_over_time](#count_le_over_time).

 #### share_eq_over_time
@@ -849,6 +914,8 @@ from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#f

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 See also [count_eq_over_time](#count_eq_over_time).

 #### stale_samples_over_time
@@ -866,6 +933,8 @@ on the given lookbehind window `d` per each time series returned from the given

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 This function is supported by PromQL.

 See also [stdvar_over_time](#stdvar_over_time).
@@ -877,35 +946,43 @@ on the given lookbehind window `d` per each time series returned from the given

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 This function is supported by PromQL.

 See also [stddev_over_time](#stddev_over_time).

 #### sum_eq_over_time

-`sum_eq_over_time(series_selector[d], eq)` is a [rollup function](#rollup-function), which calculates the sum of [raw sample](https://docs.victoriametrics.com/keyconcepts/#raw-samples)
+`sum_eq_over_time(series_selector[d], eq)` is a [rollup function](#rollup-functions), which calculates the sum of [raw sample](https://docs.victoriametrics.com/keyconcepts/#raw-samples)
 values equal to `eq` on the given lookbehind window `d` per each time series returned from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering).

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 See also [sum_over_time](#sum_over_time) and [count_eq_over_time](#count_eq_over_time).

 #### sum_gt_over_time

-`sum_gt_over_time(series_selector[d], gt)` is a [rollup function](#rollup-function), which calculates the sum of [raw sample](https://docs.victoriametrics.com/keyconcepts/#raw-samples)
+`sum_gt_over_time(series_selector[d], gt)` is a [rollup function](#rollup-functions), which calculates the sum of [raw sample](https://docs.victoriametrics.com/keyconcepts/#raw-samples)
 values bigger than `gt` on the given lookbehind window `d` per each time series returned from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering).

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 See also [sum_over_time](#sum_over_time) and [count_gt_over_time](#count_gt_over_time).

 #### sum_le_over_time

-`sum_le_over_time(series_selector[d], le)` is a [rollup function](#rollup-function), which calculates the sum of [raw sample](https://docs.victoriametrics.com/keyconcepts/#raw-samples)
+`sum_le_over_time(series_selector[d], le)` is a [rollup function](#rollup-functions), which calculates the sum of [raw sample](https://docs.victoriametrics.com/keyconcepts/#raw-samples)
 values smaller or equal to `le` on the given lookbehind window `d` per each time series returned from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering).

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 See also [sum_over_time](#sum_over_time) and [count_le_over_time](#count_le_over_time).

 #### sum_over_time
@@ -915,6 +992,8 @@ on the given lookbehind window `d` per each time series returned from the given

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 This function is supported by PromQL.

 #### sum2_over_time
@@ -924,6 +1003,8 @@ values on the given lookbehind window `d` per each time series returned from the

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 #### timestamp

 `timestamp(series_selector[d])` is a [rollup function](#rollup-functions), which returns the timestamp in seconds with millisecond precision
@@ -1001,6 +1082,8 @@ from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#f

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 See also [zscore](#zscore), [range_trim_zscore](#range_trim_zscore) and [outlier_iqr_over_time](#outlier_iqr_over_time).


@@ -2230,7 +2313,8 @@ Any [rollup function](#rollup-functions) for something other than [series select
 Nested rollup functions can be implicit thanks to the [implicit query conversions](#implicit-query-conversions).
 For example, `delta(sum(m))` is implicitly converted to `delta(sum(default_rollup(m))[1i:1i])`, so it becomes a subquery,
 since it contains [default_rollup](#default_rollup) nested into [delta](#delta).
-This behavior can be disabled or logged via cmd-line flags `-search.disableImplicitConversion` and `-search.logImplicitConversion` since v1.101.0.
+This behavior can be disabled or logged via `-search.disableImplicitConversion` and `-search.logImplicitConversion` command-line flags
+starting from [`v1.101.0` release](https://docs.victoriametrics.com/changelog/).

 VictoriaMetrics performs subqueries in the following way:

@@ -2263,5 +2347,6 @@ VictoriaMetrics performs the following implicit conversions for incoming queries
  For example, `avg_over_time(rate(http_requests_total[5m])[1h])` is automatically converted to `avg_over_time(rate(http_requests_total[5m])[1h:1i])`.
 * If something other than [series selector](https://docs.victoriametrics.com/keyconcepts/#filtering)
  is passed to [rollup function](#rollup-functions), then a [subquery](#subqueries) with `1i` lookbehind window and `1i` step is automatically formed.
-  For example, `rate(sum(up))` is automatically converted to `rate((sum(default_rollup(up)))[1i:1i])`. 
-  This behavior can be disabled or logged via cmd-line flags `-search.disableImplicitConversion` and `-search.logImplicitConversion` since v1.101.0.
+  For example, `rate(sum(up))` is automatically converted to `rate((sum(default_rollup(up)))[1i:1i])`.
+  This behavior can be disabled or logged via `-search.disableImplicitConversion` and `-search.logImplicitConversion` command-line flags
+  starting from [`v1.101.0` release](https://docs.victoriametrics.com/changelog/).
--- a/app/vlselect/vmui/victorialogs.html
+++ b/app/vlselect/vmui/victorialogs.html
@@ -0,0 +1,55 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="utf-8"/>
+  <link rel="icon" href="%PUBLIC_URL%/favicon.ico"/>
+  <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=5"/>
+  <meta name="theme-color" content="#000000"/>
+  <meta
+    name="description"
+    content="UI for VictoriaMetrics"
+  />
+  <link rel="apple-touch-icon" href="%PUBLIC_URL%/apple-touch-icon.png"/>
+  <link rel="icon" type="image/png" sizes="32x32" href="%PUBLIC_URL%/favicon-32x32.png">
+  <!--
+    manifest.json provides metadata used when your web app is installed on a
+    user's mobile device or desktop. See https://developers.google.com/web/fundamentals/web-app-manifest/
+  -->
+  <link rel="manifest" href="%PUBLIC_URL%/manifest.json"/>
+  <!--
+    Notice the use of %PUBLIC_URL% in the tags above.
+    It will be replaced with the URL of the `public` folder during the build.
+    Only files inside the `public` folder can be referenced from the HTML.
+
+    Unlike "/favicon.ico" or "favicon.ico", "%PUBLIC_URL%/favicon.ico" will
+    work correctly both with client-side routing and a non-root public URL.
+    Learn how to configure a non-root public URL by running `npm run build`.
+  -->
+  <title>VM UI</title>
+
+  <meta name="twitter:card" content="summary_large_image">
+  <meta name="twitter:image" content="%PUBLIC_URL%/preview.jpg">
+  <meta name="twitter:title" content="UI for VictoriaMetrics">
+  <meta name="twitter:description" content="Explore and troubleshoot your VictoriaMetrics data">
+  <meta name="twitter:site" content="@VictoriaMetrics">
+
+  <meta property="og:title" content="Metric explorer for VictoriaMetrics">
+  <meta property="og:description" content="Explore and troubleshoot your VictoriaMetrics data">
+  <meta property="og:image" content="%PUBLIC_URL%/preview.jpg">
+  <meta property="og:type" content="website">
+</head>
+<body>
+<noscript>You need to enable JavaScript to run this app.</noscript>
+<div id="root"></div>
+<!--
+  This HTML file is a template.
+  If you open it directly in the browser, you will see an empty page.
+
+  You can add webfonts, meta tags, or analytics to this file.
+  The build step will place the bundled scripts into the <body> tag.
+
+  To begin the development, run `npm start` or `yarn start`.
+  To create a production bundle, use `npm run build` or `yarn build`.
+-->
+</body>
+</html>
--- a/app/vlselect/vmui/victoriametrics.html
+++ b/app/vlselect/vmui/victoriametrics.html
@@ -0,0 +1,56 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="utf-8"/>
+  <link rel="icon" href="%PUBLIC_URL%/favicon.ico"/>
+  <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=5"/>
+  <meta name="theme-color" content="#000000"/>
+  <meta
+    name="description"
+    content="UI for VictoriaMetrics"
+  />
+  <link rel="apple-touch-icon" href="%PUBLIC_URL%/apple-touch-icon.png"/>
+  <link rel="icon" type="image/png" sizes="32x32" href="%PUBLIC_URL%/favicon-32x32.png">
+  <!--
+    manifest.json provides metadata used when your web app is installed on a
+    user's mobile device or desktop. See https://developers.google.com/web/fundamentals/web-app-manifest/
+  -->
+  <link rel="manifest" href="%PUBLIC_URL%/manifest.json"/>
+  <!--
+    Notice the use of %PUBLIC_URL% in the tags above.
+    It will be replaced with the URL of the `public` folder during the build.
+    Only files inside the `public` folder can be referenced from the HTML.
+
+    Unlike "/favicon.ico" or "favicon.ico", "%PUBLIC_URL%/favicon.ico" will
+    work correctly both with client-side routing and a non-root public URL.
+    Learn how to configure a non-root public URL by running `npm run build`.
+  -->
+  <title>VM UI</title>
+  <script src="%PUBLIC_URL%/dashboards/index.js" type="module"></script>
+
+  <meta name="twitter:card" content="summary_large_image">
+  <meta name="twitter:image" content="%PUBLIC_URL%/preview.jpg">
+  <meta name="twitter:title" content="UI for VictoriaMetrics">
+  <meta name="twitter:description" content="Explore and troubleshoot your VictoriaMetrics data">
+  <meta name="twitter:site" content="@VictoriaMetrics">
+
+  <meta property="og:title" content="Metric explorer for VictoriaMetrics">
+  <meta property="og:description" content="Explore and troubleshoot your VictoriaMetrics data">
+  <meta property="og:image" content="%PUBLIC_URL%/preview.jpg">
+  <meta property="og:type" content="website">
+</head>
+<body>
+<noscript>You need to enable JavaScript to run this app.</noscript>
+<div id="root"></div>
+<!--
+  This HTML file is a template.
+  If you open it directly in the browser, you will see an empty page.
+
+  You can add webfonts, meta tags, or analytics to this file.
+  The build step will place the bundled scripts into the <body> tag.
+
+  To begin the development, run `npm start` or `yarn start`.
+  To create a production bundle, use `npm run build` or `yarn build`.
+-->
+</body>
+</html>
--- a/app/vlselect/vmui/vmanomaly.html
+++ b/app/vlselect/vmui/vmanomaly.html
@@ -0,0 +1,56 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="utf-8"/>
+  <link rel="icon" href="%PUBLIC_URL%/favicon.ico"/>
+  <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=5"/>
+  <meta name="theme-color" content="#000000"/>
+  <meta
+    name="description"
+    content="UI for VictoriaMetrics"
+  />
+  <link rel="apple-touch-icon" href="%PUBLIC_URL%/apple-touch-icon.png"/>
+  <link rel="icon" type="image/png" sizes="32x32" href="%PUBLIC_URL%/favicon-32x32.png">
+  <!--
+    manifest.json provides metadata used when your web app is installed on a
+    user's mobile device or desktop. See https://developers.google.com/web/fundamentals/web-app-manifest/
+  -->
+  <link rel="manifest" href="%PUBLIC_URL%/manifest.json"/>
+  <!--
+    Notice the use of %PUBLIC_URL% in the tags above.
+    It will be replaced with the URL of the `public` folder during the build.
+    Only files inside the `public` folder can be referenced from the HTML.
+
+    Unlike "/favicon.ico" or "favicon.ico", "%PUBLIC_URL%/favicon.ico" will
+    work correctly both with client-side routing and a non-root public URL.
+    Learn how to configure a non-root public URL by running `npm run build`.
+  -->
+  <title>VM UI</title>
+  <script src="%PUBLIC_URL%/dashboards/index.js" type="module"></script>
+
+  <meta name="twitter:card" content="summary_large_image">
+  <meta name="twitter:image" content="%PUBLIC_URL%/preview.jpg">
+  <meta name="twitter:title" content="UI for VictoriaMetrics">
+  <meta name="twitter:description" content="Explore and troubleshoot your VictoriaMetrics data">
+  <meta name="twitter:site" content="@VictoriaMetrics">
+
+  <meta property="og:title" content="Metric explorer for VictoriaMetrics">
+  <meta property="og:description" content="Explore and troubleshoot your VictoriaMetrics data">
+  <meta property="og:image" content="%PUBLIC_URL%/preview.jpg">
+  <meta property="og:type" content="website">
+</head>
+<body>
+<noscript>You need to enable JavaScript to run this app.</noscript>
+<div id="root"></div>
+<!--
+  This HTML file is a template.
+  If you open it directly in the browser, you will see an empty page.
+
+  You can add webfonts, meta tags, or analytics to this file.
+  The build step will place the bundled scripts into the <body> tag.
+
+  To begin the development, run `npm start` or `yarn start`.
+  To create a production bundle, use `npm run build` or `yarn build`.
+-->
+</body>
+</html>
--- a/app/vmagent/main.go
+++ b/app/vmagent/main.go
@@ -10,6 +10,8 @@ import (
 	"strings"
 	"time"

+	"github.com/VictoriaMetrics/metrics"
+
 	"github.com/VictoriaMetrics/VictoriaMetrics/app/vmagent/csvimport"
 	"github.com/VictoriaMetrics/VictoriaMetrics/app/vmagent/datadogsketches"
 	"github.com/VictoriaMetrics/VictoriaMetrics/app/vmagent/datadogv1"
@@ -42,7 +44,7 @@ import (
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/protoparser/common"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/protoparser/opentelemetry/firehose"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/pushmetrics"
-	"github.com/VictoriaMetrics/metrics"
+	"github.com/VictoriaMetrics/VictoriaMetrics/lib/stringsutil"
 )

 var (
@@ -316,6 +318,10 @@ func requestHandler(w http.ResponseWriter, r *http.Request) bool {
 		influxQueryRequests.Inc()
 		influxutils.WriteDatabaseNames(w)
 		return true
+	case "/influx/health":
+		influxHealthRequests.Inc()
+		influxutils.WriteHealthCheckResponse(w)
+		return true
 	case "/opentelemetry/api/v1/push", "/opentelemetry/v1/metrics":
 		opentelemetryPushRequests.Inc()
 		if err := opentelemetry.InsertHandler(nil, r); err != nil {
@@ -450,7 +456,7 @@ func requestHandler(w http.ResponseWriter, r *http.Request) bool {
 		w.Header().Set("Content-Type", "application/json")
 		var bb bytesutil.ByteBuffer
 		promscrape.WriteConfigData(&bb)
-		fmt.Fprintf(w, `{"status":"success","data":{"yaml":%q}}`, bb.B)
+		fmt.Fprintf(w, `{"status":"success","data":{"yaml":%s}}`, stringsutil.JSONString(string(bb.B)))
 		return true
 	case "/prometheus/-/reload", "/-/reload":
 		if !httpserver.CheckAuthFlag(w, r, reloadAuthKey) {
@@ -562,6 +568,10 @@ func processMultitenantRequest(w http.ResponseWriter, r *http.Request, path stri
 		influxQueryRequests.Inc()
 		influxutils.WriteDatabaseNames(w)
 		return true
+	case "influx/health":
+		influxHealthRequests.Inc()
+		influxutils.WriteHealthCheckResponse(w)
+		return true
 	case "opentelemetry/api/v1/push", "opentelemetry/v1/metrics":
 		opentelemetryPushRequests.Inc()
 		if err := opentelemetry.InsertHandler(at, r); err != nil {
@@ -672,7 +682,8 @@ var (
 	influxWriteRequests = metrics.NewCounter(`vmagent_http_requests_total{path="/influx/write", protocol="influx"}`)
 	influxWriteErrors   = metrics.NewCounter(`vmagent_http_request_errors_total{path="/influx/write", protocol="influx"}`)

-	influxQueryRequests = metrics.NewCounter(`vmagent_http_requests_total{path="/influx/query", protocol="influx"}`)
+	influxQueryRequests  = metrics.NewCounter(`vmagent_http_requests_total{path="/influx/query", protocol="influx"}`)
+	influxHealthRequests = metrics.NewCounter(`vmagent_http_requests_total{path="/influx/health", protocol="influx"}`)

 	datadogv1WriteRequests = metrics.NewCounter(`vmagent_http_requests_total{path="/datadog/api/v1/series", protocol="datadog"}`)
 	datadogv1WriteErrors   = metrics.NewCounter(`vmagent_http_request_errors_total{path="/datadog/api/v1/series", protocol="datadog"}`)
--- a/app/vmagent/remotewrite/client.go
+++ b/app/vmagent/remotewrite/client.go
@@ -34,8 +34,10 @@ var (
 	rateLimit = flagutil.NewArrayInt("remoteWrite.rateLimit", 0, "Optional rate limit in bytes per second for data sent to the corresponding -remoteWrite.url. "+
 		"By default, the rate limit is disabled. It can be useful for limiting load on remote storage when big amounts of buffered data "+
 		"is sent after temporary unavailability of the remote storage. See also -maxIngestionRate")
-	sendTimeout = flagutil.NewArrayDuration("remoteWrite.sendTimeout", time.Minute, "Timeout for sending a single block of data to the corresponding -remoteWrite.url")
-	proxyURL    = flagutil.NewArrayString("remoteWrite.proxyURL", "Optional proxy URL for writing data to the corresponding -remoteWrite.url. "+
+	sendTimeout      = flagutil.NewArrayDuration("remoteWrite.sendTimeout", time.Minute, "Timeout for sending a single block of data to the corresponding -remoteWrite.url")
+	retryMinInterval = flagutil.NewArrayDuration("remoteWrite.retryMinInterval", time.Second, "The minimum delay between retry attempts to send a block of data to the corresponding -remoteWrite.url. Every next retry attempt will double the delay to prevent hammering of remote database. See also -remoteWrite.retryMaxInterval")
+	retryMaxTime     = flagutil.NewArrayDuration("remoteWrite.retryMaxTime", time.Minute, "The max time spent on retry attempts to send a block of data to the corresponding -remoteWrite.url. Change this value if it is expected for -remoteWrite.url to be unreachable for more than -remoteWrite.retryMaxTime. See also -remoteWrite.retryMinInterval")
+	proxyURL         = flagutil.NewArrayString("remoteWrite.proxyURL", "Optional proxy URL for writing data to the corresponding -remoteWrite.url. "+
 		"Supported proxies: http, https, socks5. Example: -remoteWrite.proxyURL=socks5://proxy:1234")

 	tlsHandshakeTimeout   = flagutil.NewArrayDuration("remoteWrite.tlsHandshakeTimeout", 20*time.Second, "The timeout for establishing tls connections to the corresponding -remoteWrite.url")
@@ -90,6 +92,9 @@ type client struct {
 	fq *persistentqueue.FastQueue
 	hc *http.Client

+	retryMinInterval time.Duration
+	retryMaxTime     time.Duration
+
 	sendBlock func(block []byte) bool
 	authCfg   *promauth.Config
 	awsCfg    *awsapi.Config
@@ -143,13 +148,15 @@ func newHTTPClient(argIdx int, remoteWriteURL, sanitizedURL string, fq *persiste
 		Timeout:   sendTimeout.GetOptionalArg(argIdx),
 	}
 	c := &client{
-		sanitizedURL:   sanitizedURL,
-		remoteWriteURL: remoteWriteURL,
-		authCfg:        authCfg,
-		awsCfg:         awsCfg,
-		fq:             fq,
-		hc:             hc,
-		stopCh:         make(chan struct{}),
+		sanitizedURL:     sanitizedURL,
+		remoteWriteURL:   remoteWriteURL,
+		authCfg:          authCfg,
+		awsCfg:           awsCfg,
+		fq:               fq,
+		hc:               hc,
+		retryMinInterval: retryMinInterval.GetOptionalArg(argIdx),
+		retryMaxTime:     retryMaxTime.GetOptionalArg(argIdx),
+		stopCh:           make(chan struct{}),
 	}
 	c.sendBlock = c.sendBlockHTTP

@@ -396,11 +403,11 @@ func (c *client) newRequest(url string, body []byte) (*http.Request, error) {
 // sendBlockHTTP sends the given block to c.remoteWriteURL.
 //
 // The function returns false only if c.stopCh is closed.
-// Otherwise it tries sending the block to remote storage indefinitely.
+// Otherwise, it tries sending the block to remote storage indefinitely.
 func (c *client) sendBlockHTTP(block []byte) bool {
 	c.rl.Register(len(block))
-	maxRetryDuration := timeutil.AddJitterToDuration(time.Minute)
-	retryDuration := timeutil.AddJitterToDuration(time.Second)
+	maxRetryDuration := timeutil.AddJitterToDuration(c.retryMaxTime)
+	retryDuration := timeutil.AddJitterToDuration(c.retryMinInterval)
 	retriesCount := 0

 again:
--- a/app/vmagent/remotewrite/remotewrite.go
+++ b/app/vmagent/remotewrite/remotewrite.go
@@ -441,7 +441,7 @@ func tryPush(at *auth.Token, wr *prompbmarshal.WriteRequest, forceDropSamplesOnF
 	var rctx *relabelCtx
 	rcs := allRelabelConfigs.Load()
 	pcsGlobal := rcs.global
-	if pcsGlobal.Len() > 0 {
+	if pcsGlobal.Len() > 0 || *usePromCompatibleNaming {
 		rctx = getRelabelCtx()
 		defer putRelabelCtx(rctx)
 	}
--- a/app/vmagent/remotewrite/streamaggr.go
+++ b/app/vmagent/remotewrite/streamaggr.go
@@ -50,7 +50,7 @@ var (
 	streamAggrIgnoreOldSamples = flagutil.NewArrayBool("remoteWrite.streamAggr.ignoreOldSamples", "Whether to ignore input samples with old timestamps outside the current "+
 		"aggregation interval for the corresponding -remoteWrite.streamAggr.config at the corresponding -remoteWrite.url. "+
 		"See https://docs.victoriametrics.com/stream-aggregation/#ignoring-old-samples")
-	streamAggrIgnoreFirstIntervals = flag.Int("remoteWrite.streamAggr.ignoreFirstIntervals", 0, "Number of aggregation intervals to skip after the start "+
+	streamAggrIgnoreFirstIntervals = flagutil.NewArrayInt("remoteWrite.streamAggr.ignoreFirstIntervals", 0, "Number of aggregation intervals to skip after the start "+
 		"for the corresponding -remoteWrite.streamAggr.config at the corresponding -remoteWrite.url. Increase this value if "+
 		"you observe incorrect aggregation results after vmagent restarts. It could be caused by receiving bufferred delayed data from clients pushing data into the vmagent. "+
 		"See https://docs.victoriametrics.com/stream-aggregation/#ignore-aggregation-intervals-on-start")
@@ -133,7 +133,7 @@ func initStreamAggrConfigGlobal() {
 	} else {
 		dedupInterval := streamAggrGlobalDedupInterval.Duration()
 		if dedupInterval > 0 {
-			deduplicatorGlobal = streamaggr.NewDeduplicator(pushToRemoteStoragesTrackDropped, dedupInterval, *streamAggrDropInputLabels, "dedup-global")
+			deduplicatorGlobal = streamaggr.NewDeduplicator(pushToRemoteStoragesTrackDropped, dedupInterval, *streamAggrGlobalDropInputLabels, "dedup-global")
 		}
 	}
 }
@@ -202,6 +202,7 @@ func newStreamAggrConfigGlobal() (*streamaggr.Aggregators, error) {
 		DropInputLabels:      *streamAggrGlobalDropInputLabels,
 		IgnoreOldSamples:     *streamAggrGlobalIgnoreOldSamples,
 		IgnoreFirstIntervals: *streamAggrGlobalIgnoreFirstIntervals,
+		KeepInput:            *streamAggrGlobalKeepInput,
 	}

 	sas, err := streamaggr.LoadFromFile(path, pushToRemoteStoragesTrackDropped, opts, "global")
@@ -229,7 +230,8 @@ func newStreamAggrConfigPerURL(idx int, pushFunc streamaggr.PushFunc) (*streamag
 		DedupInterval:        streamAggrDedupInterval.GetOptionalArg(idx),
 		DropInputLabels:      *streamAggrDropInputLabels,
 		IgnoreOldSamples:     streamAggrIgnoreOldSamples.GetOptionalArg(idx),
-		IgnoreFirstIntervals: *streamAggrIgnoreFirstIntervals,
+		IgnoreFirstIntervals: streamAggrIgnoreFirstIntervals.GetOptionalArg(idx),
+		KeepInput:            streamAggrKeepInput.GetOptionalArg(idx),
 	}

 	sas, err := streamaggr.LoadFromFile(path, pushFunc, opts, alias)
--- a/app/vmalert-tool/main.go
+++ b/app/vmalert-tool/main.go
@@ -41,9 +41,19 @@ Examples:
 						Usage:    "disable adding group's Name as label to generated alerts and time series.",
 						Required: false,
 					},
+					&cli.StringSliceFlag{
+						Name:     "external.label",
+						Usage:    `Optional label in the form 'name=value' to add to all generated recording rules and alerts. Supports an array of values separated by comma or specified via multiple flags.`,
+						Required: false,
+					},
+					&cli.StringFlag{
+						Name:     "external.url",
+						Usage:    `Optional external URL to template in rule's labels or annotations.`,
+						Required: false,
+					},
 				},
 				Action: func(c *cli.Context) error {
-					if failed := unittest.UnitTest(c.StringSlice("files"), c.Bool("disableAlertgroupLabel")); failed {
+					if failed := unittest.UnitTest(c.StringSlice("files"), c.Bool("disableAlertgroupLabel"), c.StringSlice("external.label"), c.String("external.url")); failed {
 						return fmt.Errorf("unittest failed")
 					}
 					return nil
--- a/app/vmalert-tool/unittest/testdata/disable-group-label.yaml
+++ b/app/vmalert-tool/unittest/testdata/disable-group-label.yaml
@@ -13,7 +13,7 @@ tests:
      - expr: suquery_interval_test
        eval_time: 4m
        exp_samples:
-          - labels: '{__name__="suquery_interval_test",datacenter="dc-123", instance="localhost:9090", job="vmagent2"}'
+          - labels: '{__name__="suquery_interval_test", instance="localhost:9090", job="vmagent2"}'
            value: 1

    alert_rule_test:
@@ -24,20 +24,16 @@ tests:
              job: vmagent2
              severity: page
              instance: localhost:9090
-              datacenter: dc-123
            exp_annotations:
              summary: "Instance localhost:9090 down"
-              description: "localhost:9090 of job vmagent2 has been down for more than 5 minutes."
+              description: "localhost:9090 of job vmagent2 in cluster  has been down for more than 5 minutes."
+              dashboard: "/d/dashboard?orgId=1"

      - eval_time: 0
        alertname: AlwaysFiring
        exp_alerts:
-          - exp_labels:
-              datacenter: dc-123
+          - {}

      - eval_time: 0
        alertname: InstanceDown
        exp_alerts: []
-
-    external_labels:
-      datacenter: dc-123
--- a/app/vmalert-tool/unittest/testdata/rules.yaml
+++ b/app/vmalert-tool/unittest/testdata/rules.yaml
@@ -8,7 +8,8 @@ groups:
          severity: page
        annotations:
          summary: "Instance {{ $labels.instance }} down"
-          description: "{{ $labels.instance }} of job {{ $labels.job }} has been down for more than 5 minutes."
+          description: "{{ $labels.instance }} of job {{ $labels.job }} in cluster {{ $externalLabels.cluster }} has been down for more than 5 minutes."
+          dashboard: '{{ $externalURL }}/d/dashboard?orgId=1'
      - alert: AlwaysFiring
        expr: 1
      - alert: SameAlertNameWithDifferentGroup
--- a/app/vmalert-tool/unittest/testdata/test1.yaml
+++ b/app/vmalert-tool/unittest/testdata/test1.yaml
@@ -16,7 +16,8 @@ tests:
        groupname: group1
        alertname: SameAlertNameWithDifferentGroup
        exp_alerts:
-          - {}
+          - exp_labels:
+              cluster: prod
      - eval_time: 1m
        groupname: group2
        alertname: SameAlertNameWithDifferentGroup
@@ -25,7 +26,8 @@ tests:
        groupname: group1
        alertname: SameAlertNameWithDifferentGroup
        exp_alerts:
-          - {}
+          - exp_labels:
+              cluster: prod
      - eval_time: 6m
        groupname: group1
        alertname: SameAlertNameWithDifferentGroup
@@ -61,18 +63,18 @@ tests:
        eval_time: 4m
        exp_samples:
          - value: 4
-            labels: '{__name__="t1", datacenter="dc-123"}'
+            labels: '{__name__="t1", cluster="prod"}'
      - expr: t2
        eval_time: 4m
        exp_samples:
          - value: 4
-            labels: '{__name__="t2", datacenter="dc-123"}'
+            labels: '{__name__="t2", cluster="prod"}'
      - expr: t3
        eval_time: 4m
        exp_samples:
          # t3 is 3 instead of 4 cause it's rules3 is evaluated before rules1
          - value: 3
-            labels: '{__name__="t3", datacenter="dc-123"}'
+            labels: '{__name__="t3", cluster="prod"}'

    alert_rule_test:
      - eval_time: 10m
@@ -83,22 +85,21 @@ tests:
              job: vmagent1
              severity: page
              instance: localhost:9090
-              datacenter: dc-123
+              cluster: prod
            exp_annotations:
              summary: "Instance localhost:9090 down"
-              description: "localhost:9090 of job vmagent1 has been down for more than 5 minutes."
+              description: "localhost:9090 of job vmagent1 in cluster prod has been down for more than 5 minutes."
+              dashboard: "http://grafana:3000/d/dashboard?orgId=1"

      - eval_time: 0
        groupname: group1
        alertname: AlwaysFiring
        exp_alerts:
          - exp_labels:
-              datacenter: dc-123
+              cluster: prod

      - eval_time: 0
        groupname: alerts
        alertname: InstanceDown
        exp_alerts: []

-    external_labels:
-      datacenter: dc-123
--- a/app/vmalert-tool/unittest/testdata/test2.yaml
+++ b/app/vmalert-tool/unittest/testdata/test2.yaml
@@ -13,7 +13,7 @@ tests:
      - expr: suquery_interval_test
        eval_time: 4m
        exp_samples:
-          - labels: '{__name__="suquery_interval_test",datacenter="dc-123", instance="localhost:9090", job="vmagent2"}'
+          - labels: '{__name__="suquery_interval_test", cluster="prod", instance="localhost:9090", job="vmagent2"}'
            value: 1

    alert_rule_test:
@@ -25,22 +25,21 @@ tests:
              job: vmagent2
              severity: page
              instance: localhost:9090
-              datacenter: dc-123
+              cluster: prod
            exp_annotations:
              summary: "Instance localhost:9090 down"
-              description: "localhost:9090 of job vmagent2 has been down for more than 5 minutes."
+              description: "localhost:9090 of job vmagent2 in cluster prod has been down for more than 5 minutes."
+              dashboard: "http://grafana:3000/d/dashboard?orgId=1"

      - eval_time: 0
        groupname: group1
        alertname: AlwaysFiring
        exp_alerts:
          - exp_labels:
-              datacenter: dc-123
+              cluster: prod

      - eval_time: 0
        groupname: group1
        alertname: InstanceDown
        exp_alerts: []

-    external_labels:
-      datacenter: dc-123
--- a/app/vmalert-tool/unittest/unittest.go
+++ b/app/vmalert-tool/unittest/unittest.go
@@ -55,7 +55,7 @@ const (
 )

 // UnitTest runs unittest for files
-func UnitTest(files []string, disableGroupLabel bool) bool {
+func UnitTest(files []string, disableGroupLabel bool, externalLabels []string, externalURL string) bool {
 	if err := templates.Load([]string{}, true); err != nil {
 		logger.Fatalf("failed to load template: %v", err)
 	}
@@ -71,14 +71,34 @@ func UnitTest(files []string, disableGroupLabel bool) bool {

 	testfiles, err := config.ReadFromFS(files)
 	if err != nil {
-		fmt.Println("  FAILED")
-		fmt.Printf("\nfailed to read test files: \n%v", err)
+		logger.Fatalf("failed to load test files %q: %v", files, err)
 	}
+	if len(testfiles) == 0 {
+		fmt.Println("no test file found")
+		return false
+	}
+
+	labels := make(map[string]string)
+	for _, s := range externalLabels {
+		if len(s) == 0 {
+			continue
+		}
+		n := strings.IndexByte(s, '=')
+		if n < 0 {
+			logger.Fatalf("missing '=' in `-label`. It must contain label in the form `name=value`; got %q", s)
+		}
+		labels[s[:n]] = s[n+1:]
+	}
+	_, err = notifier.Init(nil, labels, externalURL)
+	if err != nil {
+		logger.Fatalf("failed to init notifier: %v", err)
+	}
+
 	var failed bool
 	for fileName, file := range testfiles {
-		if err := ruleUnitTest(fileName, file); err != nil {
+		if err := ruleUnitTest(fileName, file, labels); err != nil {
 			fmt.Println("  FAILED")
-			fmt.Printf("\nfailed to run unit test for file %q: \n%v", file, err)
+			fmt.Printf("\nfailed to run unit test for file %q: \n%v", fileName, err)
 			failed = true
 		} else {
 			fmt.Println("  SUCCESS")
@@ -88,7 +108,7 @@ func UnitTest(files []string, disableGroupLabel bool) bool {
 	return failed
 }

-func ruleUnitTest(filename string, content []byte) []error {
+func ruleUnitTest(filename string, content []byte, externalLabels map[string]string) []error {
 	fmt.Println("\nUnit Testing: ", filename)
 	var unitTestInp unitTestFile
 	if err := yaml.UnmarshalStrict(content, &unitTestInp); err != nil {
@@ -126,7 +146,7 @@ func ruleUnitTest(filename string, content []byte) []error {
 			errs = append(errs, err)
 			continue
 		}
-		testErrs := t.test(unitTestInp.EvaluationInterval.Duration(), groupOrderMap, testGroups)
+		testErrs := t.test(unitTestInp.EvaluationInterval.Duration(), groupOrderMap, testGroups, externalLabels)
 		errs = append(errs, testErrs...)
 	}

@@ -163,6 +183,10 @@ func verifyTestGroup(group testGroup) error {
 			return fmt.Errorf("\n%s    missing required field \"eval_time\"", testGroupName)
 		}
 	}
+	if group.ExternalLabels != nil {
+		fmt.Printf("\n%s    warning: filed `external_labels` will be deprecated soon, please use `-external.label` cmd-line flag instead. "+
+			"Check https://github.com/VictoriaMetrics/VictoriaMetrics/issues/6735 for details.\n", testGroupName)
+	}
 	return nil
 }

@@ -179,6 +203,7 @@ func processFlags() {
 		{flag: "retentionPeriod", value: "100y"},
 		{flag: "datasource.url", value: testDataSourcePath},
 		{flag: "remoteWrite.url", value: testRemoteWritePath},
+		{flag: "notifier.blackhole", value: "true"},
 	} {
 		// panics if flag doesn't exist
 		if err := flag.Lookup(fv.flag).Value.Set(fv.value); err != nil {
@@ -239,7 +264,7 @@ func tearDown() {
 	fs.MustRemoveAll(storagePath)
 }

-func (tg *testGroup) test(evalInterval time.Duration, groupOrderMap map[string]int, testGroups []vmalertconfig.Group) (checkErrs []error) {
+func (tg *testGroup) test(evalInterval time.Duration, groupOrderMap map[string]int, testGroups []vmalertconfig.Group, externalLabels map[string]string) (checkErrs []error) {
 	// set up vmstorage and http server for ingest and read queries
 	setUp()
 	// tear down vmstorage and clean the data dir
@@ -288,7 +313,14 @@ func (tg *testGroup) test(evalInterval time.Duration, groupOrderMap map[string]i
 	// create groups with given rule
 	var groups []*rule.Group
 	for _, group := range testGroups {
-		ng := rule.NewGroup(group, q, time.Minute, tg.ExternalLabels)
+		mergedExternalLabels := make(map[string]string)
+		for k, v := range tg.ExternalLabels {
+			mergedExternalLabels[k] = v
+		}
+		for k, v := range externalLabels {
+			mergedExternalLabels[k] = v
+		}
+		ng := rule.NewGroup(group, q, time.Minute, mergedExternalLabels)
 		groups = append(groups, ng)
 	}

--- a/app/vmalert-tool/unittest/unittest_test.go
+++ b/app/vmalert-tool/unittest/unittest_test.go
@@ -18,7 +18,7 @@ func TestUnitTest_Failure(t *testing.T) {
 	f := func(files []string) {
 		t.Helper()

-		failed := UnitTest(files, false)
+		failed := UnitTest(files, false, nil, "")
 		if !failed {
 			t.Fatalf("expecting failed test")
 		}
@@ -29,18 +29,19 @@ func TestUnitTest_Failure(t *testing.T) {
 }

 func TestUnitTest_Success(t *testing.T) {
-	f := func(disableGroupLabel bool, files []string) {
+	f := func(disableGroupLabel bool, files []string, externalLabels []string, externalURL string) {
 		t.Helper()

-		failed := UnitTest(files, disableGroupLabel)
+		failed := UnitTest(files, disableGroupLabel, externalLabels, externalURL)
 		if failed {
 			t.Fatalf("unexpected failed test")
 		}
 	}

 	// run multi files
-	f(false, []string{"./testdata/test1.yaml", "./testdata/test2.yaml"})
+	f(false, []string{"./testdata/test1.yaml", "./testdata/test2.yaml"}, []string{"cluster=prod"}, "http://grafana:3000")

 	// disable group label
-	f(true, []string{"./testdata/disable-group-label.yaml"})
+	// template with null external values
+	f(true, []string{"./testdata/disable-group-label.yaml"}, nil, "")
 }
--- a/app/vmalert/datasource/init.go
+++ b/app/vmalert/datasource/init.go
@@ -17,7 +17,7 @@ import (

 var (
 	addr = flag.String("datasource.url", "", "Datasource compatible with Prometheus HTTP API. It can be single node VictoriaMetrics or vmselect endpoint. Required parameter. "+
-		"Supports address in the form of IP address with a port (e.g., 127.0.0.1:8428) or DNS SRV record. "+
+		"Supports address in the form of IP address with a port (e.g., http://127.0.0.1:8428) or DNS SRV record. "+
 		"See also -remoteRead.disablePathAppend and -datasource.showURL")
 	appendTypePrefix  = flag.Bool("datasource.appendTypePrefix", false, "Whether to add type prefix to -datasource.url based on the query type. Set to true if sending different query types to the vmselect URL.")
 	showDatasourceURL = flag.Bool("datasource.showURL", false, "Whether to avoid stripping sensitive information such as auth headers or passwords from URLs in log messages or UI and exported metrics. "+
@@ -99,7 +99,7 @@ func Init(extraParams url.Values) (QuerierBuilder, error) {

 	tr, err := httputils.Transport(*addr, *tlsCertFile, *tlsKeyFile, *tlsCAFile, *tlsServerName, *tlsInsecureSkipVerify)
 	if err != nil {
-		return nil, fmt.Errorf("failed to create transport: %w", err)
+		return nil, fmt.Errorf("failed to create transport for -datasource.url=%q: %w", *addr, err)
 	}
 	tr.DialContext = netutil.NewStatDialFunc("vmalert_datasource")
 	tr.DisableKeepAlives = *disableKeepAlive
--- a/app/vmalert/datasource/testdata/instant_response.json
+++ b/app/vmalert/datasource/testdata/instant_response.json
--- a/app/vmalert/datasource/vm_prom_api.go
+++ b/app/vmalert/datasource/vm_prom_api.go
@@ -57,20 +57,23 @@ var jsonParserPool fastjson.ParserPool
 //	[{"metric":{"__name__":"up","job":"prometheus"},value": [ 1435781451.781,"1"]},
 //	{"metric":{"__name__":"up","job":"node"},value": [ 1435781451.781,"0"]}]
 func (pi *promInstant) Unmarshal(b []byte) error {
+	var metrics []json.RawMessage
+	// metrics slice could be large, so parsing it with fastjson could consume a lot of memory.
+	// We parse the slice with standard lib to keep mem usage low.
+	// And each metric object will be parsed with fastjson to reduce allocations.
+	if err := json.Unmarshal(b, &metrics); err != nil {
+		return fmt.Errorf("cannot unmarshal metrics: %w", err)
+	}
+
 	p := jsonParserPool.Get()
 	defer jsonParserPool.Put(p)

-	v, err := p.ParseBytes(b)
-	if err != nil {
-		return err
-	}
-
-	rows, err := v.Array()
-	if err != nil {
-		return fmt.Errorf("cannot find the top-level array of result objects: %w", err)
-	}
-	pi.ms = make([]Metric, len(rows))
-	for i, row := range rows {
+	pi.ms = make([]Metric, len(metrics))
+	for i, data := range metrics {
+		row, err := p.ParseBytes(data)
+		if err != nil {
+			return fmt.Errorf("cannot parse metric object: %w", err)
+		}
 		metric := row.Get("metric")
 		if metric == nil {
 			return fmt.Errorf("can't find `metric` object in %q", row)
--- a/app/vmalert/datasource/vm_prom_api_timing_test.go
+++ b/app/vmalert/datasource/vm_prom_api_timing_test.go
@@ -1,43 +1,24 @@
 package datasource

 import (
-	"bytes"
-	"io"
-	"net/http"
 	"os"
 	"testing"
 )

-func BenchmarkMetrics(b *testing.B) {
-	payload := []byte(`[{"metric":{"__name__":"vm_rows"},"value":[1583786142,"13763"]},{"metric":{"__name__":"vm_requests", "foo":"bar", "baz": "qux"},"value":[1583786140,"2000"]}]`)
-
-	var pi promInstant
-	if err := pi.Unmarshal(payload); err != nil {
-		b.Fatalf(err.Error())
-	}
-	b.Run("Instant", func(b *testing.B) {
-		for i := 0; i < b.N; i++ {
-			_, _ = pi.metrics()
-		}
-	})
-}
-
-func BenchmarkParsePrometheusResponse(b *testing.B) {
-	req, _ := http.NewRequest("GET", "", nil)
-	resp := &http.Response{StatusCode: http.StatusOK}
+func BenchmarkPromInstantUnmarshal(b *testing.B) {
 	data, err := os.ReadFile("testdata/instant_response.json")
 	if err != nil {
 		b.Fatalf("error while reading file: %s", err)
 	}
-	resp.Body = io.NopCloser(bytes.NewReader(data))

-	b.Run("Instant", func(b *testing.B) {
+	// BenchmarkParsePrometheusResponse/Instant_std+fastjson-10                    1760            668959 ns/op          280147 B/op       5781 allocs/op
+	b.Run("Instant std+fastjson", func(b *testing.B) {
 		for i := 0; i < b.N; i++ {
-			_, err := parsePrometheusResponse(req, resp)
+			var pi promInstant
+			err = pi.Unmarshal(data)
 			if err != nil {
 				b.Fatalf("unexpected parse err: %s", err)
 			}
-			resp.Body = io.NopCloser(bytes.NewReader(data))
 		}
 	})
 }
--- a/app/vmalert/notifier/alertmanager.go
+++ b/app/vmalert/notifier/alertmanager.go
@@ -76,9 +76,6 @@ func (am *AlertManager) send(ctx context.Context, alerts []Alert, headers map[st
 		return err
 	}
 	req.Header.Set("Content-Type", "application/json")
-	for key, value := range headers {
-		req.Header.Set(key, value)
-	}

 	if am.timeout > 0 {
 		var cancel context.CancelFunc
@@ -94,6 +91,11 @@ func (am *AlertManager) send(ctx context.Context, alerts []Alert, headers map[st
 			return err
 		}
 	}
+	// external headers have higher priority
+	for key, value := range headers {
+		req.Header.Set(key, value)
+	}
+
 	resp, err := am.client.Do(req)
 	if err != nil {
 		return err
@@ -130,7 +132,8 @@ func NewAlertManager(alertManagerURL string, fn AlertURLGenerator, authCfg proma
 	}
 	tr, err := httputils.Transport(alertManagerURL, tls.CertFile, tls.KeyFile, tls.CAFile, tls.ServerName, tls.InsecureSkipVerify)
 	if err != nil {
-		return nil, fmt.Errorf("failed to create transport: %w", err)
+		return nil, fmt.Errorf("failed to create transport for alertmanager URL=%q: %w", alertManagerURL, err)
+
 	}

 	ba := new(promauth.BasicAuthConfig)
@@ -145,7 +148,9 @@ func NewAlertManager(alertManagerURL string, fn AlertURLGenerator, authCfg proma
 	aCfg, err := utils.AuthConfig(
 		utils.WithBasicAuth(ba.Username, ba.Password.String(), ba.PasswordFile),
 		utils.WithBearer(authCfg.BearerToken.String(), authCfg.BearerTokenFile),
-		utils.WithOAuth(oauth.ClientID, oauth.ClientSecret.String(), oauth.ClientSecretFile, oauth.TokenURL, strings.Join(oauth.Scopes, ";"), oauth.EndpointParams))
+		utils.WithOAuth(oauth.ClientID, oauth.ClientSecret.String(), oauth.ClientSecretFile, oauth.TokenURL, strings.Join(oauth.Scopes, ";"), oauth.EndpointParams),
+		utils.WithHeaders(strings.Join(authCfg.Headers, "^^")),
+	)
 	if err != nil {
 		return nil, fmt.Errorf("failed to configure auth: %w", err)
 	}
--- a/app/vmalert/notifier/alertmanager_test.go
+++ b/app/vmalert/notifier/alertmanager_test.go
@@ -3,6 +3,7 @@ package notifier
 import (
 	"context"
 	"encoding/json"
+	"fmt"
 	"net/http"
 	"net/http/httptest"
 	"strconv"
@@ -48,6 +49,9 @@ func TestAlertManager_Send(t *testing.T) {
 			conn, _, _ := w.(http.Hijacker).Hijack()
 			_ = conn.Close()
 		case 1:
+			if r.Header.Get(headerKey) != headerValue {
+				t.Fatalf("expected header %q to be set to %q; got %q instead", headerKey, headerValue, r.Header.Get(headerKey))
+			}
 			w.WriteHeader(500)
 		case 2:
 			var a []struct {
@@ -72,6 +76,9 @@ func TestAlertManager_Send(t *testing.T) {
 			if a[0].EndAt.IsZero() {
 				t.Fatalf("expected non-zero end time")
 			}
+			if r.Header.Get(headerKey) != "bar" {
+				t.Fatalf("expected header %q to be set to %q; got %q instead", headerKey, headerValue, r.Header.Get(headerKey))
+			}
 		case 3:
 			if r.Header.Get(headerKey) != headerValue {
 				t.Fatalf("expected header %q to be set to %q; got %q instead", headerKey, headerValue, r.Header.Get(headerKey))
@@ -86,6 +93,7 @@ func TestAlertManager_Send(t *testing.T) {
 			Username: baUser,
 			Password: promauth.NewSecret(baPass),
 		},
+		Headers: []string{fmt.Sprintf("%s:%s", headerKey, headerValue)},
 	}
 	am, err := NewAlertManager(srv.URL+alertManagerPath, func(alert Alert) string {
 		return strconv.FormatUint(alert.GroupID, 10) + "/" + strconv.FormatUint(alert.ID, 10)
@@ -105,7 +113,7 @@ func TestAlertManager_Send(t *testing.T) {
 		Start:       time.Now().UTC(),
 		End:         time.Now().UTC(),
 		Annotations: map[string]string{"a": "b", "c": "d", "e": "f"},
-	}}, nil); err != nil {
+	}}, map[string]string{headerKey: "bar"}); err != nil {
 		t.Fatalf("unexpected error %s", err)
 	}
 	if c != 2 {
--- a/app/vmalert/notifier/init.go
+++ b/app/vmalert/notifier/init.go
@@ -25,6 +25,9 @@ var (
 		"Enable this flag if you want vmalert to evaluate alerting rules without sending any notifications to external receivers (eg. alertmanager). "+
 		"-notifier.url, -notifier.config and -notifier.blackhole are mutually exclusive.")

+	headers = flagutil.NewArrayString("notifier.headers", "Optional HTTP headers to send with each request to the corresponding -notifier.url. "+
+		"For example, -remoteWrite.headers='My-Auth:foobar' would send 'My-Auth: foobar' HTTP header with every request to the corresponding -notifier.url. "+
+		"Multiple headers must be delimited by '^^': -notifier.headers='header1:value1^^header2:value2,header3:value3'")
 	basicAuthUsername     = flagutil.NewArrayString("notifier.basicAuth.username", "Optional basic auth username for -notifier.url")
 	basicAuthPassword     = flagutil.NewArrayString("notifier.basicAuth.password", "Optional basic auth password for -notifier.url")
 	basicAuthPasswordFile = flagutil.NewArrayString("notifier.basicAuth.passwordFile", "Optional path to basic auth password file for -notifier.url")
@@ -171,6 +174,7 @@ func notifiersFromFlags(gen AlertURLGenerator) ([]Notifier, error) {
 				Scopes:           strings.Split(oauth2Scopes.GetOptionalArg(i), ";"),
 				TokenURL:         oauth2TokenURL.GetOptionalArg(i),
 			},
+			Headers: []string{headers.GetOptionalArg(i)},
 		}

 		addr = strings.TrimSuffix(addr, "/")
--- a/app/vmalert/remoteread/init.go
+++ b/app/vmalert/remoteread/init.go
@@ -17,7 +17,7 @@ var (
 	addr = flag.String("remoteRead.url", "", "Optional URL to datasource compatible with Prometheus HTTP API. It can be single node VictoriaMetrics or vmselect."+
 		"Remote read is used to restore alerts state."+
 		"This configuration makes sense only if `vmalert` was configured with `remoteWrite.url` before and has been successfully persisted its state. "+
-		"Supports address in the form of IP address with a port (e.g., 127.0.0.1:8428) or DNS SRV record. "+
+		"Supports address in the form of IP address with a port (e.g., http://127.0.0.1:8428) or DNS SRV record. "+
 		"See also '-remoteRead.disablePathAppend', '-remoteRead.showURL'.")

 	showRemoteReadURL = flag.Bool("remoteRead.showURL", false, "Whether to show -remoteRead.url in the exported metrics. "+
@@ -68,7 +68,7 @@ func Init() (datasource.QuerierBuilder, error) {
 	}
 	tr, err := httputils.Transport(*addr, *tlsCertFile, *tlsKeyFile, *tlsCAFile, *tlsServerName, *tlsInsecureSkipVerify)
 	if err != nil {
-		return nil, fmt.Errorf("failed to create transport: %w", err)
+		return nil, fmt.Errorf("failed to create transport for -remoteRead.url=%q: %w", *addr, err)
 	}
 	tr.IdleConnTimeout = *idleConnectionTimeout
 	tr.DialContext = netutil.NewStatDialFunc("vmalert_remoteread")
--- a/app/vmalert/remotewrite/debug_client.go
+++ b/app/vmalert/remotewrite/debug_client.go
@@ -32,7 +32,7 @@ func NewDebugClient() (*DebugClient, error) {

 	t, err := httputils.Transport(*addr, *tlsCertFile, *tlsKeyFile, *tlsCAFile, *tlsServerName, *tlsInsecureSkipVerify)
 	if err != nil {
-		return nil, fmt.Errorf("failed to create transport: %w", err)
+		return nil, fmt.Errorf("failed to create transport for -remoteWrite.url=%q: %w", *addr, err)
 	}
 	c := &DebugClient{
 		c: &http.Client{
--- a/app/vmalert/remotewrite/init.go
+++ b/app/vmalert/remotewrite/init.go
@@ -15,7 +15,7 @@ import (
 var (
 	addr = flag.String("remoteWrite.url", "", "Optional URL to VictoriaMetrics or vminsert where to persist alerts state "+
 		"and recording rules results in form of timeseries. "+
-		"Supports address in the form of IP address with a port (e.g., 127.0.0.1:8428) or DNS SRV record. "+
+		"Supports address in the form of IP address with a port (e.g., http://127.0.0.1:8428) or DNS SRV record. "+
 		"For example, if -remoteWrite.url=http://127.0.0.1:8428 is specified, "+
 		"then the alerts state will be written to http://127.0.0.1:8428/api/v1/write . See also -remoteWrite.disablePathAppend, '-remoteWrite.showURL'.")
 	showRemoteWriteURL = flag.Bool("remoteWrite.showURL", false, "Whether to show -remoteWrite.url in the exported metrics. "+
@@ -72,7 +72,7 @@ func Init(ctx context.Context) (*Client, error) {

 	t, err := httputils.Transport(*addr, *tlsCertFile, *tlsKeyFile, *tlsCAFile, *tlsServerName, *tlsInsecureSkipVerify)
 	if err != nil {
-		return nil, fmt.Errorf("failed to create transport: %w", err)
+		return nil, fmt.Errorf("failed to create transport for -remoteWrite.url=%q: %w", *addr, err)
 	}
 	t.IdleConnTimeout = *idleConnectionTimeout
 	t.DialContext = netutil.NewStatDialFunc("vmalert_remotewrite")
--- a/app/vmalert/rule/alerting.go
+++ b/app/vmalert/rule/alerting.go
@@ -441,9 +441,6 @@ func (ar *AlertingRule) exec(ctx context.Context, ts time.Time, limit int) ([]pr
 			}
 			a.Value = m.Values[0]
 			a.Annotations = annotations
-			if err != nil {
-				return nil, err
-			}
 			a.KeepFiringSince = time.Time{}
 			continue
 		}
--- a/app/vmauth/auth_config.go
+++ b/app/vmauth/auth_config.go
@@ -83,7 +83,6 @@ type UserInfo struct {

 	concurrencyLimitCh      chan struct{}
 	concurrencyLimitReached *metrics.Counter
-	overrideHostHeader      bool

 	rt http.RoundTripper

@@ -94,8 +93,9 @@ type UserInfo struct {

 // HeadersConf represents config for request and response headers.
 type HeadersConf struct {
-	RequestHeaders  []*Header `yaml:"headers,omitempty"`
-	ResponseHeaders []*Header `yaml:"response_headers,omitempty"`
+	RequestHeaders   []*Header `yaml:"headers,omitempty"`
+	ResponseHeaders  []*Header `yaml:"response_headers,omitempty"`
+	KeepOriginalHost *bool     `yaml:"keep_original_host,omitempty"`
 }

 func (ui *UserInfo) beginConcurrencyLimit() error {
@@ -150,15 +150,6 @@ func (h *Header) MarshalYAML() (any, error) {
 	return h.sOriginal, nil
 }

-func overrideHostHeader(headers []*Header) bool {
-	for _, h := range headers {
-		if h.Name == "Host" && h.Value == "" {
-			return true
-		}
-	}
-	return false
-}
-
 // URLMap is a mapping from source paths to target urls.
 type URLMap struct {
 	// SrcPaths is an optional list of regular expressions, which must match the request path.
@@ -310,12 +301,18 @@ func (up *URLPrefix) getBackendsCount() int {

 // getBackendURL returns the backendURL depending on the load balance policy.
 //
+// It can return nil if there are no backend urls available at the moment.
+//
 // backendURL.put() must be called on the returned backendURL after the request is complete.
 func (up *URLPrefix) getBackendURL() *backendURL {
 	up.discoverBackendAddrsIfNeeded()

 	pbus := up.bus.Load()
 	bus := *pbus
+	if len(bus) == 0 {
+		return nil
+	}
+
 	if up.loadBalancingPolicy == "first_available" {
 		return getFirstAvailableBackendURL(bus)
 	}
@@ -397,7 +394,7 @@ func (up *URLPrefix) discoverBackendAddrsIfNeeded() {
 			buCopy.Host = addr
 			if port != "" {
 				if n := strings.IndexByte(buCopy.Host, ':'); n >= 0 {
-					// Drop the discovered port and substitute it the the port specified in bu.
+					// Drop the discovered port and substitute it the port specified in bu.
 					buCopy.Host = buCopy.Host[:n]
 				}
 				buCopy.Host += ":" + port
@@ -464,7 +461,7 @@ func getLeastLoadedBackendURL(bus []*backendURL, atomicCounter *atomic.Uint32) *
 	}

 	// Slow path - select other backend urls.
-	n := atomicCounter.Add(1)
+	n := atomicCounter.Add(1) - 1

 	for i := uint32(0); i < uint32(len(bus)); i++ {
 		idx := (n + i) % uint32(len(bus))
@@ -600,7 +597,7 @@ func initAuthConfig() {
 	// See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/1240
 	sighupCh := procutil.NewSighupChan()

-	_, err := loadAuthConfig()
+	_, err := reloadAuthConfig()
 	if err != nil {
 		logger.Fatalf("cannot load auth config: %s", err)
 	}
@@ -632,7 +629,7 @@ func authConfigReloader(sighupCh <-chan os.Signal) {

 	updateFn := func() {
 		configReloads.Inc()
-		updated, err := loadAuthConfig()
+		updated, err := reloadAuthConfig()
 		if err != nil {
 			logger.Errorf("failed to load auth config; using the last successfully loaded config; error: %s", err)
 			configSuccess.Set(0)
@@ -658,27 +655,45 @@ func authConfigReloader(sighupCh <-chan os.Signal) {
 	}
 }

-// authConfigData stores the yaml definition for this config.
-// authConfigData needs to be updated each time authConfig is updated.
-var authConfigData atomic.Pointer[[]byte]
-
 var (
-	authConfig   atomic.Pointer[AuthConfig]
-	authUsers    atomic.Pointer[map[string]*UserInfo]
+	// authConfigData stores the yaml definition for this config.
+	// authConfigData needs to be updated each time authConfig is updated.
+	authConfigData atomic.Pointer[[]byte]
+
+	// authConfig contains the currently loaded auth config
+	authConfig atomic.Pointer[AuthConfig]
+
+	// authUsers contains the currently loaded auth users
+	authUsers atomic.Pointer[map[string]*UserInfo]
+
 	authConfigWG sync.WaitGroup
 	stopCh       chan struct{}
 )

-// loadAuthConfig loads and applies the config from *authConfigPath.
+// reloadAuthConfig loads and applies the config from *authConfigPath.
 // It returns bool value to identify if new config was applied.
 // The config can be not applied if there is a parsing error
 // or if there are no changes to the current authConfig.
-func loadAuthConfig() (bool, error) {
+func reloadAuthConfig() (bool, error) {
 	data, err := fscore.ReadFileOrHTTP(*authConfigPath)
 	if err != nil {
 		return false, fmt.Errorf("failed to read -auth.config=%q: %w", *authConfigPath, err)
 	}

+	ok, err := reloadAuthConfigData(data)
+	if err != nil {
+		return false, fmt.Errorf("failed to pars -auth.config=%q: %w", *authConfigPath, err)
+	}
+	if !ok {
+		return false, nil
+	}
+
+	mp := authUsers.Load()
+	logger.Infof("loaded information about %d users from -auth.config=%q", len(*mp), *authConfigPath)
+	return true, nil
+}
+
+func reloadAuthConfigData(data []byte) (bool, error) {
 	oldData := authConfigData.Load()
 	if oldData != nil && bytes.Equal(data, *oldData) {
 		// there are no updates in the config - skip reloading.
@@ -687,14 +702,13 @@ func loadAuthConfig() (bool, error) {

 	ac, err := parseAuthConfig(data)
 	if err != nil {
-		return false, fmt.Errorf("failed to parse -auth.config=%q: %w", *authConfigPath, err)
+		return false, fmt.Errorf("failed to parse auth config: %w", err)
 	}

 	m, err := parseAuthConfigUsers(ac)
 	if err != nil {
-		return false, fmt.Errorf("failed to parse users from -auth.config=%q: %w", *authConfigPath, err)
+		return false, fmt.Errorf("failed to parse users from auth config: %w", err)
 	}
-	logger.Infof("loaded information about %d users from -auth.config=%q", len(m), *authConfigPath)

 	acPrev := authConfig.Load()
 	if acPrev != nil {
@@ -741,7 +755,6 @@ func parseAuthConfig(data []byte) (*AuthConfig, error) {
 		if err := ui.initURLs(); err != nil {
 			return nil, err
 		}
-		ui.overrideHostHeader = overrideHostHeader(ui.HeadersConf.RequestHeaders)

 		metricLabels, err := ui.getMetricLabels()
 		if err != nil {
@@ -806,7 +819,6 @@ func parseAuthConfigUsers(ac *AuthConfig) (map[string]*UserInfo, error) {
 		_ = ac.ms.GetOrCreateGauge(`vmauth_user_concurrent_requests_current`+metricLabels, func() float64 {
 			return float64(len(ui.concurrencyLimitCh))
 		})
-		ui.overrideHostHeader = overrideHostHeader(ui.HeadersConf.RequestHeaders)

 		rt, err := newRoundTripper(ui.TLSCAFile, ui.TLSCertFile, ui.TLSKeyFile, ui.TLSServerName, ui.TLSInsecureSkipVerify)
 		if err != nil {
@@ -997,6 +1009,14 @@ func getAuthTokensFromRequest(r *http.Request) []string {
 		}
 	}

+	// Authorization via http://user:pass@hosname/path
+	if u := r.URL.User; u != nil && u.Username() != "" {
+		username := u.Username()
+		password, _ := u.Password()
+		at := getHTTPAuthBasicToken(username, password)
+		ats = append(ats, at)
+	}
+
 	return ats
 }

@@ -1022,10 +1042,6 @@ func (up *URLPrefix) sanitizeAndInitialize() error {
 }

 func sanitizeURLPrefix(urlPrefix *url.URL) (*url.URL, error) {
-	// Remove trailing '/' from urlPrefix
-	for strings.HasSuffix(urlPrefix.Path, "/") {
-		urlPrefix.Path = urlPrefix.Path[:len(urlPrefix.Path)-1]
-	}
 	// Validate urlPrefix
 	if urlPrefix.Scheme != "http" && urlPrefix.Scheme != "https" {
 		return nil, fmt.Errorf("unsupported scheme for `url_prefix: %q`: %q; must be `http` or `https`", urlPrefix, urlPrefix.Scheme)
--- a/app/vmauth/auth_config_test.go
+++ b/app/vmauth/auth_config_test.go
@@ -82,6 +82,14 @@ users:
  headers: foobar
 `)

+	// Invalid keep_original_host value
+	f(`
+users:
+- username: foo
+  url_prefix: http://foo.bar
+  keep_original_host: foobar
+`)
+
 	// empty url_prefix
 	f(`
 users:
@@ -410,7 +418,7 @@ users:
 				HeadersConf: HeadersConf{
 					RequestHeaders: []*Header{
 						mustNewHeader("'foo: bar'"),
-						mustNewHeader("'xxx: y'"),
+						mustNewHeader("'xxx:'"),
 					},
 				},
 			},
@@ -429,7 +437,7 @@ users:
    url_prefix: ["http://vminsert1/insert/0/prometheus","http://vminsert2/insert/0/prometheus"]
    headers:
    - "foo: bar"
-    - "xxx: y"
+    - "xxx:"
 `, map[string]*UserInfo{
 		getHTTPAuthBearerToken("foo"):    sharedUserInfo,
 		getHTTPAuthBasicToken("foo", ""): sharedUserInfo,
@@ -458,6 +466,7 @@ users:
 	})

 	// with default url
+	keepOriginalHost := true
 	f(`
 users:
 - bearer_token: foo
@@ -469,6 +478,7 @@ users:
    headers:
    - "foo: bar"
    - "xxx: y"
+    keep_original_host: true
  default_url:
  - http://default1/select/0/prometheus
  - http://default2/select/0/prometheus
@@ -491,6 +501,7 @@ users:
 							mustNewHeader("'foo: bar'"),
 							mustNewHeader("'xxx: y'"),
 						},
+						KeepOriginalHost: &keepOriginalHost,
 					},
 				},
 			},
@@ -517,6 +528,7 @@ users:
 							mustNewHeader("'foo: bar'"),
 							mustNewHeader("'xxx: y'"),
 						},
+						KeepOriginalHost: &keepOriginalHost,
 					},
 				},
 			},
@@ -536,12 +548,17 @@ users:
  metric_labels:
    dc: eu
    team: dev
+  keep_original_host: true
 - username: foo-same
  password: bar
  url_prefix: https://bar/x
  metric_labels:
    backend_env: test
    team: accounting
+  headers:
+  - "foo: bar"
+  response_headers:
+  - "Abc: def"
 `, map[string]*UserInfo{
 		getHTTPAuthBasicToken("foo-same", "baz"): {
 			Username:  "foo-same",
@@ -551,6 +568,9 @@ users:
 				"dc":   "eu",
 				"team": "dev",
 			},
+			HeadersConf: HeadersConf{
+				KeepOriginalHost: &keepOriginalHost,
+			},
 		},
 		getHTTPAuthBasicToken("foo-same", "bar"): {
 			Username:  "foo-same",
@@ -560,6 +580,14 @@ users:
 				"backend_env": "test",
 				"team":        "accounting",
 			},
+			HeadersConf: HeadersConf{
+				RequestHeaders: []*Header{
+					mustNewHeader("'foo: bar'"),
+				},
+				ResponseHeaders: []*Header{
+					mustNewHeader("'Abc: def'"),
+				},
+			},
 		},
 	})
 }
@@ -695,9 +723,9 @@ func TestGetLeastLoadedBackendURL(t *testing.T) {

 	fn := func(ns ...int) {
 		t.Helper()
-		bus := up.bus.Load()
-		pbus := *bus
-		for i, b := range pbus {
+		pbus := up.bus.Load()
+		bus := *pbus
+		for i, b := range bus {
 			got := int(b.concurrentRequests.Load())
 			exp := ns[i]
 			if got != exp {
@@ -707,39 +735,39 @@ func TestGetLeastLoadedBackendURL(t *testing.T) {
 	}

 	up.getBackendURL()
-	fn(0, 1, 0)
+	fn(1, 0, 0)
 	up.getBackendURL()
-	fn(0, 1, 1)
+	fn(1, 1, 0)
 	up.getBackendURL()
 	fn(1, 1, 1)

 	up.getBackendURL()
 	up.getBackendURL()
-	fn(1, 2, 2)
+	fn(2, 2, 1)

 	bus := up.bus.Load()
 	pbus := *bus
 	pbus[0].concurrentRequests.Add(2)
 	pbus[2].concurrentRequests.Add(5)
-	fn(3, 2, 7)
+	fn(4, 2, 6)

 	up.getBackendURL()
-	fn(3, 3, 7)
+	fn(4, 3, 6)

 	up.getBackendURL()
-	fn(3, 4, 7)
+	fn(4, 4, 6)

 	up.getBackendURL()
-	fn(4, 4, 7)
+	fn(4, 5, 6)

 	up.getBackendURL()
-	fn(5, 4, 7)
+	fn(5, 5, 6)

 	up.getBackendURL()
-	fn(5, 5, 7)
+	fn(6, 5, 6)

 	up.getBackendURL()
-	fn(6, 5, 7)
+	fn(6, 6, 6)

 	up.getBackendURL()
 	fn(6, 6, 7)
--- a/app/vmauth/main.go
+++ b/app/vmauth/main.go
@@ -50,7 +50,7 @@ var (
 		`Such requests are always counted at vmauth_http_request_errors_total{reason="invalid_auth_token"} metric, which is exposed at /metrics page`)
 	failTimeout               = flag.Duration("failTimeout", 3*time.Second, "Sets a delay period for load balancing to skip a malfunctioning backend")
 	maxRequestBodySizeToRetry = flagutil.NewBytes("maxRequestBodySizeToRetry", 16*1024, "The maximum request body size, which can be cached and re-tried at other backends. "+
-		"Bigger values may require more memory. Negative or zero values disable request body caching and retries.")
+		"Bigger values may require more memory. Zero or negative value disables caching of request body. This may be useful when proxying data ingestion requests")
 	backendTLSInsecureSkipVerify = flag.Bool("backend.tlsInsecureSkipVerify", false, "Whether to skip TLS verification when connecting to backends over HTTPS. "+
 		"See https://docs.victoriametrics.com/vmauth/#backend-tls-setup")
 	backendTLSCAFile = flag.String("backend.TLSCAFile", "", "Optional path to TLS root CA file, which is used for TLS verification when connecting to backends over HTTPS. "+
@@ -117,8 +117,7 @@ func requestHandler(w http.ResponseWriter, r *http.Request) bool {
 			return true
 		}

-		w.Header().Set("WWW-Authenticate", `Basic realm="Restricted"`)
-		http.Error(w, "missing `Authorization` request header", http.StatusUnauthorized)
+		handleMissingAuthorizationError(w)
 		return true
 	}

@@ -189,26 +188,27 @@ func processRequest(w http.ResponseWriter, r *http.Request, ui *UserInfo) {
 			// to a route that is not in the configuration for unauthorized user.
 			// See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/5236
 			if ui.BearerToken == "" && ui.Username == "" && len(*authUsers.Load()) > 0 {
-				w.Header().Set("WWW-Authenticate", `Basic realm="Restricted"`)
-				http.Error(w, "missing `Authorization` request header", http.StatusUnauthorized)
+				handleMissingAuthorizationError(w)
 				return
 			}
 			missingRouteRequests.Inc()
-			httpserver.Errorf(w, r, "missing route for %q", u.String())
+			httpserver.Errorf(w, r, "missing route for %s", u.String())
 			return
 		}
 		up, hc = ui.DefaultURL, ui.HeadersConf
 		isDefault = true
 	}
-	// caching makes sense only for positive non zero size
-	if maxRequestBodySizeToRetry.IntN() > 0 {
-		rtb := getReadTrackingBody(r.Body, int(r.ContentLength))
-		defer putReadTrackingBody(rtb)
-		r.Body = rtb
-	}
+
+	rtb := getReadTrackingBody(r.Body, maxRequestBodySizeToRetry.IntN())
+	defer putReadTrackingBody(rtb)
+	r.Body = rtb
+
 	maxAttempts := up.getBackendsCount()
 	for i := 0; i < maxAttempts; i++ {
 		bu := up.getBackendURL()
+		if bu == nil {
+			break
+		}
 		targetURL := bu.url
 		// Don't change path and add request_path query param for default route.
 		if isDefault {
@@ -218,7 +218,15 @@ func processRequest(w http.ResponseWriter, r *http.Request, ui *UserInfo) {
 		} else { // Update path for regular routes.
 			targetURL = mergeURLs(targetURL, u, up.dropSrcPathPrefixParts)
 		}
-		ok := tryProcessingRequest(w, r, targetURL, hc, up.retryStatusCodes, ui)
+
+		wasLocalRetry := false
+	again:
+		ok, needLocalRetry := tryProcessingRequest(w, r, targetURL, hc, up.retryStatusCodes, ui)
+		if needLocalRetry && !wasLocalRetry {
+			wasLocalRetry = true
+			goto again
+		}
+
 		bu.put()
 		if ok {
 			return
@@ -226,29 +234,28 @@ func processRequest(w http.ResponseWriter, r *http.Request, ui *UserInfo) {
 		bu.setBroken()
 	}
 	err := &httpserver.ErrorWithStatusCode{
-		Err:        fmt.Errorf("all the backends for the user %q are unavailable", ui.name()),
-		StatusCode: http.StatusServiceUnavailable,
+		Err:        fmt.Errorf("all the %d backends for the user %q are unavailable", up.getBackendsCount(), ui.name()),
+		StatusCode: http.StatusBadGateway,
 	}
 	httpserver.Errorf(w, r, "%s", err)
 	ui.backendErrors.Inc()
 }

-func tryProcessingRequest(w http.ResponseWriter, r *http.Request, targetURL *url.URL, hc HeadersConf, retryStatusCodes []int, ui *UserInfo) bool {
-	// This code has been copied from net/http/httputil/reverseproxy.go
+func tryProcessingRequest(w http.ResponseWriter, r *http.Request, targetURL *url.URL, hc HeadersConf, retryStatusCodes []int, ui *UserInfo) (bool, bool) {
 	req := sanitizeRequestHeaders(r)
-	req.URL = targetURL

-	if req.URL.Scheme == "https" || ui.overrideHostHeader {
-		// Override req.Host only for https requests, since https server verifies hostnames during TLS handshake,
-		// so it expects the targetURL.Host in the request.
-		// There is no need in overriding the req.Host for http requests, since it is expected that backend server
-		// may properly process queries with the original req.Host.
-		req.Host = targetURL.Host
-	}
+	req.URL = targetURL
+	req.Header.Set("User-Agent", "vmauth")
 	updateHeadersByConfig(req.Header, hc.RequestHeaders)
-	var trivialRetries int
+	if hc.KeepOriginalHost == nil || !*hc.KeepOriginalHost {
+		if host := getHostHeader(hc.RequestHeaders); host != "" {
+			req.Host = host
+		} else {
+			req.Host = targetURL.Host
+		}
+	}
+
 	rtb, rtbOK := req.Body.(*readTrackingBody)
-again:
 	res, err := ui.rt.RoundTrip(req)
 	if err != nil {
 		if errors.Is(err, context.Canceled) || errors.Is(err, context.DeadlineExceeded) {
@@ -260,7 +267,7 @@ again:
 				// Timed out request must be counted as errors, since this usually means that the backend is slow.
 				ui.backendErrors.Inc()
 			}
-			return true
+			return true, false
 		}
 		if !rtbOK || !rtb.canRetry() {
 			// Request body cannot be re-sent to another backend. Return the error to the client then.
@@ -270,19 +277,19 @@ again:
 			}
 			httpserver.Errorf(w, r, "%s", err)
 			ui.backendErrors.Inc()
-			return true
+			return true, false
 		}
-		// one time retry trivial network errors, such as proxy idle timeout misconfiguration or socket close by OS
-		if (netutil.IsTrivialNetworkError(err) || errors.Is(err, io.EOF)) && trivialRetries < 1 {
-			trivialRetries++
-			goto again
+		if netutil.IsTrivialNetworkError(err) {
+			// Retry request at the same backend on trivial network errors, such as proxy idle timeout misconfiguration or socket close by OS
+			return false, true
 		}
+
 		// Retry the request if its body wasn't read yet. This usually means that the backend isn't reachable.
 		remoteAddr := httpserver.GetQuotedRemoteAddr(r)
 		// NOTE: do not use httpserver.GetRequestURI
 		// it explicitly reads request body, which may fail retries.
 		logger.Warnf("remoteAddr: %s; requestURI: %s; retrying the request to %s because of response error: %s", remoteAddr, req.URL, targetURL, err)
-		return false
+		return false, false
 	}
 	if slices.Contains(retryStatusCodes, res.StatusCode) {
 		_ = res.Body.Close()
@@ -296,7 +303,7 @@ again:
 			}
 			httpserver.Errorf(w, r, "%s", err)
 			ui.backendErrors.Inc()
-			return true
+			return true, false
 		}
 		// Retry requests at other backends if it matches retryStatusCodes.
 		// See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/4893
@@ -305,7 +312,7 @@ again:
 		// it explicitly reads request body, which may fail retries.
 		logger.Warnf("remoteAddr: %s; requestURI: %s; retrying the request to %s because response status code=%d belongs to retry_status_codes=%d",
 			remoteAddr, req.URL, targetURL, res.StatusCode, retryStatusCodes)
-		return false
+		return false, false
 	}
 	removeHopHeaders(res.Header)
 	copyHeader(w.Header(), res.Header)
@@ -321,9 +328,9 @@ again:
 		remoteAddr := httpserver.GetQuotedRemoteAddr(r)
 		requestURI := httpserver.GetRequestURI(r)
 		logger.Warnf("remoteAddr: %s; requestURI: %s; error when proxying response body from %s: %s", remoteAddr, requestURI, targetURL, err)
-		return true
+		return true, false
 	}
-	return true
+	return true, false
 }

 var copyBufPool bytesutil.ByteBufferPool
@@ -336,12 +343,21 @@ func copyHeader(dst, src http.Header) {
 	}
 }

-func updateHeadersByConfig(headers http.Header, config []*Header) {
-	for _, h := range config {
+func getHostHeader(headers []*Header) string {
+	for _, h := range headers {
+		if h.Name == "Host" {
+			return h.Value
+		}
+	}
+	return ""
+}
+
+func updateHeadersByConfig(dst http.Header, src []*Header) {
+	for _, h := range src {
 		if h.Value == "" {
-			headers.Del(h.Name)
+			dst.Del(h.Name)
 		} else {
-			headers.Set(h.Name, h.Value)
+			dst.Set(h.Name, h.Value)
 		}
 	}
 }
@@ -481,6 +497,11 @@ See the docs at https://docs.victoriametrics.com/vmauth/ .
 	flagutil.Usage(s)
 }

+func handleMissingAuthorizationError(w http.ResponseWriter) {
+	w.Header().Set("WWW-Authenticate", `Basic realm="Restricted"`)
+	http.Error(w, "missing 'Authorization' request header", http.StatusUnauthorized)
+}
+
 func handleConcurrencyLimitError(w http.ResponseWriter, r *http.Request, err error) {
 	w.Header().Add("Retry-After", "10")
 	err = &httpserver.ErrorWithStatusCode{
@@ -490,85 +511,124 @@ func handleConcurrencyLimitError(w http.ResponseWriter, r *http.Request, err err
 	httpserver.Errorf(w, r, "%s", err)
 }

+// readTrackingBody must be obtained via getReadTrackingBody()
 type readTrackingBody struct {
+	// maxBodySize is the maximum body size to cache in buf.
+	//
+	// Bigger bodies cannot be retried.
+	maxBodySize int
+
 	// r contains reader for initial data reading
 	r io.ReadCloser

-	// buf is a buffer for data read from r. Buf size is limited by maxRequestBodySizeToRetry.
-	// If more than maxRequestBodySizeToRetry is read from r, then cannotRetry is set to true.
+	// buf is a buffer for data read from r. Buf size is limited by maxBodySize.
+	// If more than maxBodySize is read from r, then cannotRetry is set to true.
 	buf []byte

-	// cannotRetry is set to true when more than maxRequestBodySizeToRetry are read from r.
+	// readBuf points to the cached data at buf, which must be read in the next call to Read().
+	readBuf []byte
+
+	// cannotRetry is set to true when more than maxBodySize bytes are read from r.
 	// In this case the read data cannot fit buf, so it cannot be re-read from buf.
 	cannotRetry bool

 	// bufComplete is set to true when buf contains complete request body read from r.
 	bufComplete bool
-
-	// offset is an offset at buf for the next data read if needReadBuf is set to true.
-	offset int
 }

-// Read implements io.Reader interface
-// tracks body reading requests
+func (rtb *readTrackingBody) reset() {
+	rtb.maxBodySize = 0
+	rtb.r = nil
+	rtb.buf = rtb.buf[:0]
+	rtb.readBuf = nil
+	rtb.cannotRetry = false
+	rtb.bufComplete = false
+}
+
+func getReadTrackingBody(r io.ReadCloser, maxBodySize int) *readTrackingBody {
+	v := readTrackingBodyPool.Get()
+	if v == nil {
+		v = &readTrackingBody{}
+	}
+	rtb := v.(*readTrackingBody)
+
+	if maxBodySize < 0 {
+		maxBodySize = 0
+	}
+	rtb.maxBodySize = maxBodySize
+
+	if r == nil {
+		// This is GET request without request body
+		r = (*zeroReader)(nil)
+	}
+	rtb.r = r
+	return rtb
+}
+
+type zeroReader struct{}
+
+func (r *zeroReader) Read(_ []byte) (int, error) {
+	return 0, io.EOF
+}
+func (r *zeroReader) Close() error {
+	return nil
+}
+
+func putReadTrackingBody(rtb *readTrackingBody) {
+	rtb.reset()
+	readTrackingBodyPool.Put(rtb)
+}
+
+var readTrackingBodyPool sync.Pool
+
+// Read implements io.Reader interface.
 func (rtb *readTrackingBody) Read(p []byte) (int, error) {
-	if rtb.offset < len(rtb.buf) {
-		if rtb.cannotRetry {
-			return 0, fmt.Errorf("cannot retry reading data from buf")
-		}
-		nb := copy(p, rtb.buf[rtb.offset:])
-		rtb.offset += nb
-		if rtb.bufComplete {
-			if rtb.offset == len(rtb.buf) {
-				return nb, io.EOF
-			}
-			return nb, nil
-		}
-		if nb < len(p) {
-			nr, err := rtb.readFromStream(p[nb:])
-			return nb + nr, err
-		}
-		return nb, nil
+	if len(rtb.readBuf) > 0 {
+		n := copy(p, rtb.readBuf)
+		rtb.readBuf = rtb.readBuf[n:]
+		return n, nil
 	}
-	if rtb.bufComplete {
-		return 0, io.EOF
-	}
-	return rtb.readFromStream(p)
-}

-func (rtb *readTrackingBody) readFromStream(p []byte) (int, error) {
 	if rtb.r == nil {
-		return 0, fmt.Errorf("cannot read data after closing the reader")
+		if rtb.bufComplete {
+			return 0, io.EOF
+		}
+		return 0, fmt.Errorf("cannot read client request body after closing client reader")
 	}
+
 	n, err := rtb.r.Read(p)
 	if rtb.cannotRetry {
 		return n, err
 	}
-	if rtb.offset+n > maxRequestBodySizeToRetry.IntN() {
-		rtb.cannotRetry = true
-	}
-	if n > 0 {
-		rtb.offset += n
-		rtb.buf = append(rtb.buf, p[:n]...)
-	}
-	if err != nil {
-		if err == io.EOF {
-			rtb.bufComplete = true
-			return n, err
-		}
+
+	if len(rtb.buf)+n > rtb.maxBodySize {
 		rtb.cannotRetry = true
 		return n, err
 	}
-	return n, nil
+	rtb.buf = append(rtb.buf, p[:n]...)
+	if err == io.EOF {
+		rtb.bufComplete = true
+	}
+	return n, err
 }

 func (rtb *readTrackingBody) canRetry() bool {
-	return !rtb.cannotRetry
+	if rtb.cannotRetry {
+		return false
+	}
+	if rtb.bufComplete {
+		return true
+	}
+	return rtb.r != nil
 }

 // Close implements io.Closer interface.
 func (rtb *readTrackingBody) Close() error {
-	rtb.offset = 0
+	if !rtb.cannotRetry {
+		rtb.readBuf = rtb.buf
+	} else {
+		rtb.readBuf = nil
+	}

 	// Close rtb.r only if the request body is completely read or if it is too big.
 	// http.Roundtrip performs body.Close call even without any Read calls,
@@ -584,38 +644,3 @@ func (rtb *readTrackingBody) Close() error {

 	return nil
 }
-
-var readTrackingBodyPool sync.Pool
-
-func getReadTrackingBody(origin io.ReadCloser, b int) *readTrackingBody {
-	bufSize := 1024
-	if b > 0 && b < maxRequestBodySizeToRetry.IntN() {
-		bufSize = b
-	}
-	v := readTrackingBodyPool.Get()
-	if v == nil {
-		v = &readTrackingBody{
-			buf: make([]byte, 0, bufSize),
-		}
-	}
-	rtb := v.(*readTrackingBody)
-	rtb.r = origin
-	if bufSize > cap(rtb.buf) {
-		rtb.buf = make([]byte, 0, bufSize)
-	}
-
-	return rtb
-}
-
-func putReadTrackingBody(rtb *readTrackingBody) {
-	if rtb.r != nil {
-		_ = rtb.r.Close()
-	}
-	rtb.r = nil
-	rtb.buf = rtb.buf[:0]
-	rtb.offset = 0
-	rtb.cannotRetry = false
-	rtb.bufComplete = false
-
-	readTrackingBodyPool.Put(rtb)
-}
--- a/app/vmauth/main_test.go
+++ b/app/vmauth/main_test.go
@@ -2,18 +2,520 @@ package main

 import (
 	"bytes"
+	"fmt"
 	"io"
+	"net"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"sync/atomic"
 	"testing"
+
+	"github.com/VictoriaMetrics/VictoriaMetrics/lib/netutil"
 )

-func TestReadTrackingBodyRetrySuccess(t *testing.T) {
-	f := func(s string) {
+func TestRequestHandler(t *testing.T) {
+	f := func(cfgStr, requestURL string, backendHandler http.HandlerFunc, responseExpected string) {
 		t.Helper()
-		rtb := &readTrackingBody{
-			r: io.NopCloser(bytes.NewBufferString(s)),
+
+		ts := httptest.NewServer(backendHandler)
+		defer ts.Close()
+
+		cfgStr = strings.ReplaceAll(cfgStr, "{BACKEND}", ts.URL)
+		responseExpected = strings.ReplaceAll(responseExpected, "{BACKEND}", ts.URL)
+
+		cfgOrigP := authConfigData.Load()
+		if _, err := reloadAuthConfigData([]byte(cfgStr)); err != nil {
+			t.Fatalf("cannot load config data: %s", err)
 		}
+		defer func() {
+			cfgOrig := []byte("unauthorized_user:\n  url_prefix: http://foo/bar")
+			if cfgOrigP != nil {
+				cfgOrig = *cfgOrigP
+			}
+			_, err := reloadAuthConfigData(cfgOrig)
+			if err != nil {
+				t.Fatalf("cannot load the original config: %s", err)
+			}
+		}()
+
+		r, err := http.NewRequest(http.MethodGet, requestURL, nil)
+		if err != nil {
+			t.Fatalf("cannot initialize http request: %s", err)
+		}
+
+		r.RequestURI = r.URL.RequestURI()
+		r.RemoteAddr = "42.2.3.84:6789"
+		r.Header.Set("X-Forwarded-For", "12.34.56.78")
+		r.Header.Set("Connection", "Some-Header,Other-Header")
+		r.Header.Set("Some-Header", "foobar")
+		r.Header.Set("Pass-Header", "abc")
+
+		w := &fakeResponseWriter{}
+		if !requestHandler(w, r) {
+			t.Fatalf("unexpected false is returned from requestHandler")
+		}
+
+		response := w.getResponse()
+		response = strings.ReplaceAll(response, "\r\n", "\n")
+		response = strings.TrimSpace(response)
+		responseExpected = strings.TrimSpace(responseExpected)
+		if response != responseExpected {
+			t.Fatalf("unexpected response\ngot\n%s\nwant\n%s", response, responseExpected)
+		}
+	}
+
+	// regular url_prefix
+	cfgStr := `
+unauthorized_user:
+  url_prefix: {BACKEND}/foo?bar=baz`
+	requestURL := "http://some-host.com/abc/def?some_arg=some_value"
+	backendHandler := func(w http.ResponseWriter, r *http.Request) {
+		h := w.Header()
+		h.Set("Connection", "close")
+		h.Set("Foo", "bar")
+
+		var bb bytes.Buffer
+		if err := r.Header.Write(&bb); err != nil {
+			panic(fmt.Errorf("unexpected error when marshaling headers: %w", err))
+		}
+		fmt.Fprintf(w, "requested_url=http://%s%s\n%s", r.Host, r.URL, bb.String())
+	}
+	responseExpected := `
+statusCode=200
+Foo: bar
+requested_url={BACKEND}/foo/abc/def?bar=baz&some_arg=some_value
+Pass-Header: abc
+User-Agent: vmauth
+X-Forwarded-For: 12.34.56.78, 42.2.3.84`
+	f(cfgStr, requestURL, backendHandler, responseExpected)
+
+	// keep_original_host
+	cfgStr = `
+unauthorized_user:
+  url_prefix: "{BACKEND}/foo?bar=baz"
+  keep_original_host: true`
+	requestURL = "http://some-host.com/abc/def"
+	backendHandler = func(w http.ResponseWriter, r *http.Request) {
+		fmt.Fprintf(w, "requested_url=http://%s%s", r.Host, r.URL)
+	}
+	responseExpected = `
+statusCode=200
+requested_url=http://some-host.com/foo/abc/def?bar=baz`
+	f(cfgStr, requestURL, backendHandler, responseExpected)
+
+	// override user-agent header
+	cfgStr = `
+unauthorized_user:
+  url_prefix: "{BACKEND}/foo?bar=baz"
+  headers:
+  - "User-Agent: foobar"`
+	requestURL = "http://some-host.com/abc/def"
+	backendHandler = func(w http.ResponseWriter, r *http.Request) {
+		fmt.Fprintf(w, "requested_url=http://%s%s\nUser-Agent=%s", r.Host, r.URL, r.Header.Get("User-Agent"))
+	}
+	responseExpected = `
+statusCode=200
+requested_url={BACKEND}/foo/abc/def?bar=baz
+User-Agent=foobar`
+	f(cfgStr, requestURL, backendHandler, responseExpected)
+
+	// delete user-agent header
+	cfgStr = `
+unauthorized_user:
+  url_prefix: "{BACKEND}/foo?bar=baz"
+  headers:
+  - "User-Agent:"`
+	requestURL = "http://some-host.com/abc/def"
+	backendHandler = func(w http.ResponseWriter, r *http.Request) {
+		fmt.Fprintf(w, "requested_url=http://%s%s\nUser-Agent=%s", r.Host, r.URL, r.Header.Get("User-Agent"))
+	}
+	responseExpected = `
+statusCode=200
+requested_url={BACKEND}/foo/abc/def?bar=baz
+User-Agent=Go-http-client/1.1`
+	f(cfgStr, requestURL, backendHandler, responseExpected)
+
+	// override request host with non-empty host
+	cfgStr = `
+unauthorized_user:
+  url_prefix: "{BACKEND}/foo?bar=baz"
+  headers:
+  - "Host: other-host:12345"
+  - "abc:"`
+	requestURL = "http://some-host.com/abc/def"
+	backendHandler = func(w http.ResponseWriter, r *http.Request) {
+		fmt.Fprintf(w, "requested_url=http://%s%s", r.Host, r.URL)
+	}
+	responseExpected = `
+statusCode=200
+requested_url=http://other-host:12345/foo/abc/def?bar=baz`
+	f(cfgStr, requestURL, backendHandler, responseExpected)
+
+	// override request host with empty host
+	cfgStr = `
+unauthorized_user:
+  url_prefix: "{BACKEND}/foo?bar=baz"
+  headers:
+  - "Host:"`
+	requestURL = "http://some-host.com/abc/def"
+	backendHandler = func(w http.ResponseWriter, r *http.Request) {
+		fmt.Fprintf(w, "requested_url=http://%s%s", r.Host, r.URL)
+	}
+	responseExpected = `
+statusCode=200
+requested_url={BACKEND}/foo/abc/def?bar=baz`
+	f(cfgStr, requestURL, backendHandler, responseExpected)
+
+	// /-/reload handler failure
+	origAuthKey := reloadAuthKey.Get()
+	if err := reloadAuthKey.Set("secret"); err != nil {
+		t.Fatalf("unexpected error: %s", err)
+	}
+	cfgStr = `
+unauthorized_user:
+  url_prefix: "{BACKEND}/foo"`
+	requestURL = "http://some-host.com/-/reload"
+	backendHandler = func(_ http.ResponseWriter, _ *http.Request) {
+		panic(fmt.Errorf("backend handler shouldn't be called"))
+	}
+	responseExpected = `
+statusCode=401
+The provided authKey doesn't match -reloadAuthKey`
+	f(cfgStr, requestURL, backendHandler, responseExpected)
+	if err := reloadAuthKey.Set(origAuthKey); err != nil {
+		t.Fatalf("unexpected error: %s", err)
+	}
+
+	// missing authorization
+	cfgStr = `
+users:
+- username: foo
+  url_prefix: "{BACKEND}/bar"`
+	requestURL = "http://some-host.com/a/b"
+	backendHandler = func(_ http.ResponseWriter, _ *http.Request) {
+		panic(fmt.Errorf("backend handler shouldn't be called"))
+	}
+	responseExpected = `
+statusCode=401
+Www-Authenticate: Basic realm="Restricted"
+missing 'Authorization' request header`
+	f(cfgStr, requestURL, backendHandler, responseExpected)
+
+	// incorrect authorization
+	cfgStr = `
+users:
+- username: foo
+  password: secret
+  url_prefix: "{BACKEND}/bar"`
+	requestURL = "http://foo:invalid-secret@some-host.com/a/b"
+	backendHandler = func(_ http.ResponseWriter, _ *http.Request) {
+		panic(fmt.Errorf("backend handler shouldn't be called"))
+	}
+	responseExpected = `
+statusCode=401
+Unauthorized`
+	f(cfgStr, requestURL, backendHandler, responseExpected)
+
+	// incorrect authorization with logging invalid auth tokens
+	origLogInvalidAuthTokens := *logInvalidAuthTokens
+	*logInvalidAuthTokens = true
+	cfgStr = `
+users:
+- username: foo
+  password: secret
+  url_prefix: "{BACKEND}/bar"`
+	requestURL = "http://foo:invalid-secret@some-host.com/a/b?c=d"
+	backendHandler = func(_ http.ResponseWriter, _ *http.Request) {
+		panic(fmt.Errorf("backend handler shouldn't be called"))
+	}
+	responseExpected = `
+statusCode=401
+remoteAddr: "42.2.3.84:6789, X-Forwarded-For: 12.34.56.78"; requestURI: /a/b?c=d; cannot authorize request with auth tokens ["http_auth:Basic Zm9vOmludmFsaWQtc2VjcmV0"]`
+	f(cfgStr, requestURL, backendHandler, responseExpected)
+	*logInvalidAuthTokens = origLogInvalidAuthTokens
+
+	// correct authorization
+	cfgStr = `
+users:
+- username: foo
+  password: secret
+  url_prefix: "{BACKEND}/bar"`
+	requestURL = "http://foo:secret@some-host.com/a/b"
+	backendHandler = func(w http.ResponseWriter, r *http.Request) {
+		fmt.Fprintf(w, "requested_url=http://%s%s", r.Host, r.URL)
+	}
+	responseExpected = `
+statusCode=200
+requested_url={BACKEND}/bar/a/b`
+	f(cfgStr, requestURL, backendHandler, responseExpected)
+
+	// verify how path cleanup works
+	cfgStr = `
+unauthorized_user:
+  url_prefix: {BACKEND}/foo?bar=baz`
+	requestURL = "http://some-host.com/../../a//.///bar/"
+	backendHandler = func(w http.ResponseWriter, r *http.Request) {
+		fmt.Fprintf(w, "requested_url=http://%s%s", r.Host, r.URL)
+	}
+	responseExpected = `
+statusCode=200
+requested_url={BACKEND}/foo/a/bar/?bar=baz`
+	f(cfgStr, requestURL, backendHandler, responseExpected)
+
+	// verify how path cleanup works for url without path
+	cfgStr = `
+unauthorized_user:
+  url_prefix: {BACKEND}/foo?bar=baz`
+	requestURL = "http://some-host.com/"
+	backendHandler = func(w http.ResponseWriter, r *http.Request) {
+		fmt.Fprintf(w, "requested_url=http://%s%s", r.Host, r.URL)
+	}
+	responseExpected = `
+statusCode=200
+requested_url={BACKEND}/foo?bar=baz`
+	f(cfgStr, requestURL, backendHandler, responseExpected)
+
+	// verify how path cleanup works for url without path if url_prefix path ends with /
+	cfgStr = `
+unauthorized_user:
+  url_prefix: {BACKEND}/foo/?bar=baz`
+	requestURL = "http://some-host.com/"
+	backendHandler = func(w http.ResponseWriter, r *http.Request) {
+		fmt.Fprintf(w, "requested_url=http://%s%s", r.Host, r.URL)
+	}
+	responseExpected = `
+statusCode=200
+requested_url={BACKEND}/foo/?bar=baz`
+	f(cfgStr, requestURL, backendHandler, responseExpected)
+
+	// verify how path cleanup works for url without path and the url_prefix without path prefix
+	cfgStr = `
+unauthorized_user:
+  url_prefix: {BACKEND}/?bar=baz`
+	requestURL = "http://some-host.com/"
+	backendHandler = func(w http.ResponseWriter, r *http.Request) {
+		fmt.Fprintf(w, "requested_url=http://%s%s", r.Host, r.URL)
+	}
+	responseExpected = `
+statusCode=200
+requested_url={BACKEND}/?bar=baz`
+	f(cfgStr, requestURL, backendHandler, responseExpected)
+
+	// verify routing to default_url
+	cfgStr = `
+unauthorized_user:
+  url_map:
+  - src_paths: ["/foo/.+"]
+    url_prefix: {BACKEND}/x-foo/
+  default_url: {BACKEND}/404.html`
+	requestURL = "http://some-host.com/abc?de=fg"
+	backendHandler = func(w http.ResponseWriter, r *http.Request) {
+		fmt.Fprintf(w, "requested_url=http://%s%s", r.Host, r.URL)
+	}
+	responseExpected = `
+statusCode=200
+requested_url={BACKEND}/404.html?request_path=http%3A%2F%2Fsome-host.com%2Fabc%3Fde%3Dfg`
+	f(cfgStr, requestURL, backendHandler, responseExpected)
+
+	// verify routing to default url_prefix
+	cfgStr = `
+unauthorized_user:
+  url_map:
+  - src_paths: ["/foo/.+"]
+    url_prefix: {BACKEND}/x-foo/
+  url_prefix: {BACKEND}/default`
+	requestURL = "http://some-host.com/abc?de=fg"
+	backendHandler = func(w http.ResponseWriter, r *http.Request) {
+		fmt.Fprintf(w, "requested_url=http://%s%s", r.Host, r.URL)
+	}
+	responseExpected = `
+statusCode=200
+requested_url={BACKEND}/default/abc?de=fg`
+	f(cfgStr, requestURL, backendHandler, responseExpected)
+
+	// missing default_url and default url_prefix for unauthorized user
+	cfgStr = `
+unauthorized_user:
+  url_map:
+  - src_paths: ["/foo/.+"]
+    url_prefix: {BACKEND}/x-foo/`
+	requestURL = "http://some-host.com/abc?de=fg"
+	backendHandler = func(_ http.ResponseWriter, _ *http.Request) {
+		panic(fmt.Errorf("backend handler shouldn't be called"))
+	}
+	responseExpected = `
+statusCode=400
+remoteAddr: "42.2.3.84:6789, X-Forwarded-For: 12.34.56.78"; requestURI: /abc?de=fg; missing route for http://some-host.com/abc?de=fg`
+	f(cfgStr, requestURL, backendHandler, responseExpected)
+
+	// missing default_url and default url_prefix for unauthorized user when there are configs for authorized users
+	cfgStr = `
+users:
+- username: some-user
+  url_map:
+  - src_paths: ["/foo/.+"]
+    url_prefix: {BACKEND}/x-foo/
+unauthorized_user:
+  url_map:
+  - src_paths: ["/abc/.*"]
+    url_prefix: {BACKEND}/x-bar`
+	requestURL = "http://some-host.com/abc?de=fg"
+	backendHandler = func(_ http.ResponseWriter, _ *http.Request) {
+		panic(fmt.Errorf("backend handler shouldn't be called"))
+	}
+	responseExpected = `
+statusCode=401
+Www-Authenticate: Basic realm="Restricted"
+missing 'Authorization' request header`
+	f(cfgStr, requestURL, backendHandler, responseExpected)
+
+	// all the backend_urls are unavailable for unauthorized user
+	cfgStr = `
+unauthorized_user:
+  url_map:
+  - src_paths: ["/foo/.*"]
+    url_prefix:
+    - http://127.0.0.1:1/
+    - http://127.0.0.1:2/`
+	requestURL = "http://some-host.com/foo/?de=fg"
+	backendHandler = func(_ http.ResponseWriter, _ *http.Request) {
+		panic(fmt.Errorf("backend handler shouldn't be called"))
+	}
+	responseExpected = `
+statusCode=502
+remoteAddr: "42.2.3.84:6789, X-Forwarded-For: 12.34.56.78"; requestURI: /foo/?de=fg; all the 2 backends for the user "" are unavailable`
+	f(cfgStr, requestURL, backendHandler, responseExpected)
+
+	// all the backend_urls are unavailable for authorized user
+	cfgStr = `
+users:
+- username: some-user
+  url_map:
+  - src_paths: ["/foo/.*"]
+    url_prefix:
+    - http://127.0.0.1:1/
+    - http://127.0.0.1:2/`
+	requestURL = "http://some-user@some-host.com/foo/?de=fg"
+	backendHandler = func(_ http.ResponseWriter, _ *http.Request) {
+		panic(fmt.Errorf("backend handler shouldn't be called"))
+	}
+	responseExpected = `
+statusCode=502
+remoteAddr: "42.2.3.84:6789, X-Forwarded-For: 12.34.56.78"; requestURI: /foo/?de=fg; all the 2 backends for the user "some-user" are unavailable`
+	f(cfgStr, requestURL, backendHandler, responseExpected)
+
+	// zero discovered backend IPs
+	customResolver := &fakeResolver{
+		Resolver: &net.Resolver{},
+		lookupIPAddrResults: map[string][]net.IPAddr{
+			"some-addr": {},
+		},
+	}
+	origResolver := netutil.Resolver
+	netutil.Resolver = customResolver
+	cfgStr = `
+unauthorized_user:
+  url_prefix: ['http://some-addr:1234/foo/bar']
+  discover_backend_ips: true`
+	requestURL = "http://abc.com/def/?de=fg"
+	backendHandler = func(_ http.ResponseWriter, _ *http.Request) {
+		panic(fmt.Errorf("backend handler shouldn't be called"))
+	}
+	responseExpected = `
+statusCode=502
+remoteAddr: "42.2.3.84:6789, X-Forwarded-For: 12.34.56.78"; requestURI: /def/?de=fg; all the 0 backends for the user "" are unavailable`
+	f(cfgStr, requestURL, backendHandler, responseExpected)
+	netutil.Resolver = origResolver
+
+	// retry_status_codes failure
+	var retries atomic.Int64
+	cfgStr = `
+unauthorized_user:
+  url_prefix: ['{BACKEND}/path1', '{BACKEND}/path2']
+  retry_status_codes: [500, 502]`
+	requestURL = "http://some-host.com/foo/?de=fg"
+	backendHandler = func(w http.ResponseWriter, _ *http.Request) {
+		retries.Add(1)
+		w.WriteHeader(500)
+	}
+	responseExpected = `
+statusCode=502
+remoteAddr: "42.2.3.84:6789, X-Forwarded-For: 12.34.56.78"; requestURI: /foo/?de=fg; all the 2 backends for the user "" are unavailable`
+	f(cfgStr, requestURL, backendHandler, responseExpected)
+	if n := retries.Load(); n != 2 {
+		t.Fatalf("unexpected number of retries; got %d; want 2", n)
+	}
+
+	// retry_status_codes success
+	retries.Store(0)
+	cfgStr = `
+unauthorized_user:
+  url_prefix: ['{BACKEND}/path1', '{BACKEND}/path2']
+  retry_status_codes: [500, 502]`
+	requestURL = "http://some-host.com/foo/?de=fg"
+	backendHandler = func(w http.ResponseWriter, r *http.Request) {
+		if n := retries.Add(1); n < 2 {
+			w.WriteHeader(500)
+			return
+		}
+		fmt.Fprintf(w, "requested_url=http://%s%s", r.Host, r.URL)
+	}
+	responseExpected = `
+statusCode=200
+requested_url={BACKEND}/path2/foo/?de=fg`
+	f(cfgStr, requestURL, backendHandler, responseExpected)
+	if n := retries.Load(); n != 2 {
+		t.Fatalf("unexpected number of retries; got %d; want 2", n)
+	}
+}
+
+type fakeResponseWriter struct {
+	h http.Header
+
+	bb bytes.Buffer
+}
+
+func (w *fakeResponseWriter) getResponse() string {
+	return w.bb.String()
+}
+
+func (w *fakeResponseWriter) Header() http.Header {
+	if w.h == nil {
+		w.h = http.Header{}
+	}
+	return w.h
+}
+
+func (w *fakeResponseWriter) Write(p []byte) (int, error) {
+	return w.bb.Write(p)
+}
+
+func (w *fakeResponseWriter) WriteHeader(statusCode int) {
+	fmt.Fprintf(&w.bb, "statusCode=%d\n", statusCode)
+	if w.h == nil {
+		return
+	}
+	err := w.h.WriteSubset(&w.bb, map[string]bool{
+		"Content-Length":         true,
+		"Content-Type":           true,
+		"Date":                   true,
+		"X-Content-Type-Options": true,
+	})
+	if err != nil {
+		panic(fmt.Errorf("cannot marshal headers: %s", err))
+	}
+}
+
+func TestReadTrackingBody_RetrySuccess(t *testing.T) {
+	f := func(s string, maxBodySize int) {
+		t.Helper()
+
+		rtb := getReadTrackingBody(io.NopCloser(bytes.NewBufferString(s)), maxBodySize)
+		defer putReadTrackingBody(rtb)
+
 		if !rtb.canRetry() {
-			t.Fatalf("canRetry() must return true")
+			t.Fatalf("canRetry() must return true before reading anything")
 		}
 		for i := 0; i < 5; i++ {
 			data, err := io.ReadAll(rtb)
@@ -32,41 +534,99 @@ func TestReadTrackingBodyRetrySuccess(t *testing.T) {
 		}
 	}

-	f("")
-	f("foo")
-	f("foobar")
-	f(newTestString(maxRequestBodySizeToRetry.IntN()))
+	f("", 0)
+	f("", -1)
+	f("", 100)
+	f("foo", 100)
+	f("foobar", 100)
+	f(newTestString(1000), 1000)
 }

-func TestReadTrackingBodyRetryFailure(t *testing.T) {
-	f := func(s string) {
+func TestReadTrackingBody_RetrySuccessPartialRead(t *testing.T) {
+	f := func(s string, maxBodySize int) {
 		t.Helper()
-		rtb := &readTrackingBody{
-			r: io.NopCloser(bytes.NewBufferString(s)),
+
+		// Check the case with partial read
+		rtb := getReadTrackingBody(io.NopCloser(bytes.NewBufferString(s)), maxBodySize)
+		defer putReadTrackingBody(rtb)
+
+		for i := 0; i < len(s); i++ {
+			buf := make([]byte, i)
+			n, err := io.ReadFull(rtb, buf)
+			if err != nil {
+				t.Fatalf("unexpected error when reading %d bytes: %s", i, err)
+			}
+			if n != i {
+				t.Fatalf("unexpected number of bytes read; got %d; want %d", n, i)
+			}
+			if string(buf) != s[:i] {
+				t.Fatalf("unexpected data read with the length %d\ngot\n%s\nwant\n%s", i, buf, s[:i])
+			}
+			if err := rtb.Close(); err != nil {
+				t.Fatalf("unexpected error when closing reader after reading %d bytes", i)
+			}
+			if !rtb.canRetry() {
+				t.Fatalf("canRetry() must return true after closing the reader after reading %d bytes", i)
+			}
+		}
+
+		data, err := io.ReadAll(rtb)
+		if err != nil {
+			t.Fatalf("unexpected error when reading all the data: %s", err)
+		}
+		if string(data) != s {
+			t.Fatalf("unexpected data read\ngot\n%s\nwant\n%s", data, s)
+		}
+		if err := rtb.Close(); err != nil {
+			t.Fatalf("unexpected error when closing readTrackingBody: %s", err)
 		}
 		if !rtb.canRetry() {
-			t.Fatalf("canRetry() must return true")
+			t.Fatalf("canRetry() must return true after closing the reader after reading all the input")
+		}
+	}
+
+	f("", 0)
+	f("", -1)
+	f("", 100)
+	f("foo", 100)
+	f("foobar", 100)
+	f(newTestString(1000), 1000)
+}
+
+func TestReadTrackingBody_RetryFailureTooBigBody(t *testing.T) {
+	f := func(s string, maxBodySize int) {
+		t.Helper()
+
+		rtb := getReadTrackingBody(io.NopCloser(bytes.NewBufferString(s)), maxBodySize)
+		defer putReadTrackingBody(rtb)
+
+		if !rtb.canRetry() {
+			t.Fatalf("canRetry() must return true before reading anything")
 		}
 		buf := make([]byte, 1)
-		n, err := rtb.Read(buf)
+		n, err := io.ReadFull(rtb, buf)
 		if err != nil {
 			t.Fatalf("unexpected error when reading a single byte: %s", err)
 		}
 		if n != 1 {
 			t.Fatalf("unexpected number of bytes read; got %d; want 1", n)
 		}
+		if !rtb.canRetry() {
+			t.Fatalf("canRetry() must return true after reading one byte")
+		}
 		data, err := io.ReadAll(rtb)
 		if err != nil {
 			t.Fatalf("unexpected error when reading all the data: %s", err)
 		}
-		if string(buf)+string(data) != s {
-			t.Fatalf("unexpected data read\ngot\n%s\nwant\n%s", string(buf)+string(data), s)
+		dataRead := string(buf) + string(data)
+		if dataRead != s {
+			t.Fatalf("unexpected data read\ngot\n%s\nwant\n%s", dataRead, s)
 		}
 		if err := rtb.Close(); err != nil {
 			t.Fatalf("unexpected error when closing readTrackingBody: %s", err)
 		}
 		if rtb.canRetry() {
-			t.Fatalf("canRetry() must return false")
+			t.Fatalf("canRetry() must return false after closing the reader")
 		}

 		data, err = io.ReadAll(rtb)
@@ -78,132 +638,55 @@ func TestReadTrackingBodyRetryFailure(t *testing.T) {
 		}
 	}

-	f(newTestString(maxRequestBodySizeToRetry.IntN() + 1))
-	f(newTestString(2 * maxRequestBodySizeToRetry.IntN()))
+	const maxBodySize = 1000
+	f(newTestString(maxBodySize+1), maxBodySize)
+	f(newTestString(2*maxBodySize), maxBodySize)
 }

-// request body not over maxRequestBodySizeToRetry
-// 1. When writing data downstream, buf only caches part of the data because the downstream connection is disconnected.
-// 2. retry request: because buf caches some data, first read buf and then read stream when retrying
-// 3. retry request: the data has been read to buf in the second step. if the request fails, retry to read all buf later.
-func TestRetryReadSuccessAfterPartialRead(t *testing.T) {
-	f := func(s string) {
-		rtb := &readTrackingBody{
-			r:   io.NopCloser(bytes.NewBufferString(s)),
-			buf: make([]byte, 0, len(s)),
-		}
+func TestReadTrackingBody_RetryFailureZeroOrNegativeMaxBodySize(t *testing.T) {
+	f := func(s string, maxBodySize int) {
+		t.Helper()

-		var data []byte
-		var err error
-		halfSize := len(s) / 2
-		if halfSize == 0 {
-			halfSize = 100
-		}
-		buf := make([]byte, halfSize)
-		var n int
+		rtb := getReadTrackingBody(io.NopCloser(bytes.NewBufferString(s)), maxBodySize)
+		defer putReadTrackingBody(rtb)

-		// read part of the data
-		n, err = rtb.Read(buf[:])
-		data = append(data, buf[:n]...)
-		if err != nil && err != io.EOF {
-			t.Fatalf("unexpected error: %s", err)
+		if !rtb.canRetry() {
+			t.Fatalf("canRetry() must return true before reading anything")
+		}
+		data, err := io.ReadAll(rtb)
+		if err != nil {
+			t.Fatalf("unexpected error when reading all the data: %s", err)
+		}
+		if string(data) != s {
+			t.Fatalf("unexpected data read\ngot\n%s\nwant\n%s", data, s)
 		}
-
-		// request failed when output stream is closed (eg: server connection reset)
-		// would close the reader
 		if err := rtb.Close(); err != nil {
 			t.Fatalf("unexpected error when closing readTrackingBody: %s", err)
 		}
-		if !rtb.canRetry() {
-			t.Fatalf("canRetry() must return true")
-		}

-		// retry read (read buf + remaining data)
-		data = data[:0]
-		err = nil
-		for err == nil {
-			n, err = rtb.Read(buf[:])
-			data = append(data, buf[:n]...)
-		}
-		if err != io.EOF {
-			t.Fatalf("unexpected error: %s", err)
-		}
-		if string(data) != s {
-			t.Fatalf("unexpected data read; got\n%s\nwant\n%s", data, s)
-		}
-		// cannotRetry return false
-		// because the request data is not over maxRequestBodySizeToRetry limit
-		if !rtb.canRetry() {
-			t.Fatalf("canRetry() must return true")
-		}
-	}
-
-	f("")
-	f("foo")
-	f("foobar")
-	f(newTestString(maxRequestBodySizeToRetry.IntN()))
-}
-
-// request body over maxRequestBodySizeToRetry
-// 1. When writing data downstream, buf only caches part of the data because the downstream connection is disconnected.
-// 2. retry request: because buf caches some data, first read buf and then read stream when retrying
-// 3. retry request: the data has been read to buf in the second step. if the request fails, retry to read all buf later.
-func TestRetryReadSuccessAfterPartialReadAndCannotRetryAgain(t *testing.T) {
-	f := func(s string) {
-		rtb := &readTrackingBody{
-			r:   io.NopCloser(bytes.NewBufferString(s)),
-			buf: make([]byte, 0, len(s)),
-		}
-
-		var data []byte
-		var err error
-		halfSize := len(s) / 2
-		if halfSize == 0 {
-			halfSize = 100
-		}
-		buf := make([]byte, halfSize)
-		var n int
-
-		// read part of the data
-		n, err = rtb.Read(buf[:])
-		data = append(data, buf[:n]...)
-		if err != nil && err != io.EOF {
-			t.Fatalf("unexpected error: %s", err)
-		}
-
-		// request failed when output stream is closed (eg: server connection reset)
-		if err := rtb.Close(); err != nil {
-			t.Fatalf("unexpected error when closing readTrackingBody: %s", err)
-		}
-		if !rtb.canRetry() {
-			t.Fatalf("canRetry() must return true")
-		}
-
-		// retry read (read buf + remaining data)
-		data = data[:0]
-		err = nil
-		for err == nil {
-			n, err = rtb.Read(buf[:])
-			data = append(data, buf[:n]...)
-		}
-		if err != io.EOF {
-			t.Fatalf("unexpected error: %s", err)
-		}
-		if string(data) != s {
-			t.Fatalf("unexpected data read; got\n%s\nwant\n%s", data, s)
-		}
-
-		// cannotRetry returns true
-		// because the request data is over maxRequestBodySizeToRetry limit
 		if rtb.canRetry() {
-			t.Fatalf("canRetry() must return false")
+			t.Fatalf("canRetry() must return false after closing the reader")
+		}
+		data, err = io.ReadAll(rtb)
+		if err == nil {
+			t.Fatalf("expecting non-nil error")
+		}
+		if len(data) != 0 {
+			t.Fatalf("unexpected non-empty data read: %q", data)
 		}
 	}

-	f(newTestString(maxRequestBodySizeToRetry.IntN() + 1))
-	f(newTestString(2 * maxRequestBodySizeToRetry.IntN()))
+	f("foobar", 0)
+	f(newTestString(1000), 0)
+
+	f("foobar", -1)
+	f(newTestString(1000), -1)
 }

 func newTestString(sLen int) string {
-	return string(make([]byte, sLen))
+	data := make([]byte, sLen)
+	for i := range data {
+		data[i] = byte(i)
+	}
+	return string(data)
 }
--- a/app/vmauth/target_url_test.go
+++ b/app/vmauth/target_url_test.go
@@ -335,13 +335,62 @@ func TestUserInfoGetBackendURL_SRV(t *testing.T) {
 		t.Fatalf("cannot initialize urls inside UserInfo: %s", err)
 	}

-	f(ui, `/select/0/prometheus/api/v1/query?query=up`, "http://10.6.142.51:8481/select/0/prometheus/api/v1/query?query=up")
 	f(ui, `/select/0/prometheus/api/v1/query?query=up`, "http://10.6.142.50:8481/select/0/prometheus/api/v1/query?query=up")
+	f(ui, `/select/0/prometheus/api/v1/query?query=up`, "http://10.6.142.51:8481/select/0/prometheus/api/v1/query?query=up")
 	f(ui, `/insert/0/prometheus/api/v1/write`, "http://10.6.142.52:8480/insert/0/prometheus/api/v1/write")
 	// unsuccessful dns resolve
 	f(ui, `/test`, "http://non-exist-dns-addr/test")
 }

+func TestUserInfoGetBackendURL_SRVZeroBackends(t *testing.T) {
+	f := func(ui *UserInfo, requestURI string) {
+		t.Helper()
+
+		u, err := url.Parse(requestURI)
+		if err != nil {
+			t.Fatalf("cannot parse %q: %s", requestURI, err)
+		}
+		u = normalizeURL(u)
+		up, _ := ui.getURLPrefixAndHeaders(u, nil)
+		if up == nil {
+			t.Fatalf("cannot match available backend: %s", err)
+		}
+		bu := up.getBackendURL()
+		if bu != nil {
+			t.Fatalf("expecting nil backendURL; got %v", bu)
+		}
+	}
+
+	customResolver := &fakeResolver{
+		Resolver: &net.Resolver{},
+		lookupSRVResults: map[string][]*net.SRV{
+			"vmselect": {},
+		},
+	}
+	origResolver := netutil.Resolver
+	netutil.Resolver = customResolver
+	defer func() {
+		netutil.Resolver = origResolver
+	}()
+
+	allowed := true
+	ui := &UserInfo{
+		URLMaps: []URLMap{
+			{
+				SrcPaths:  getRegexs([]string{"/select/.+"}),
+				URLPrefix: mustParseURL("http://srv+vmselect"),
+			},
+		},
+		DiscoverBackendIPs: &allowed,
+		URLPrefix:          mustParseURL("http://non-exist-dns-addr"),
+	}
+	if err := ui.initURLs(); err != nil {
+		t.Fatalf("cannot initialize urls inside UserInfo: %s", err)
+	}
+
+	f(ui, `/select/0/prometheus/api/v1/query?query=up`)
+}
+
 func TestCreateTargetURLFailure(t *testing.T) {
 	f := func(ui *UserInfo, requestURI string) {
 		t.Helper()
--- a/app/vmctl/backoff/backoff.go
+++ b/app/vmctl/backoff/backoff.go
@@ -10,12 +10,6 @@ import (
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
 )

-const (
-	backoffRetries     = 10
-	backoffFactor      = 1.8
-	backoffMinDuration = time.Second * 2
-)
-
 // retryableFunc describes call back which will repeat on errors
 type retryableFunc func() error

@@ -30,12 +24,22 @@ type Backoff struct {
 }

 // New initialize backoff object
-func New() *Backoff {
-	return &Backoff{
-		retries:     backoffRetries,
-		factor:      backoffFactor,
-		minDuration: backoffMinDuration,
+func New(retries int, factor float64, minDuration time.Duration) (*Backoff, error) {
+	if retries <= 0 {
+		return nil, fmt.Errorf("number of backoff retries must be greater than 0")
 	}
+	if factor <= 1 {
+		return nil, fmt.Errorf("backoff retry factor must be greater than 1")
+	}
+	if minDuration <= 0 {
+		return nil, fmt.Errorf("backoff retry minimum duration must be greater than 0")
+	}
+
+	return &Backoff{
+		retries:     retries,
+		factor:      factor,
+		minDuration: minDuration,
+	}, nil
 }

 // Retry process retries until all attempts are completed
--- a/app/vmctl/backoff/backoff_test.go
+++ b/app/vmctl/backoff/backoff_test.go
@@ -3,6 +3,7 @@ package backoff
 import (
 	"context"
 	"fmt"
+	"strings"
 	"testing"
 	"time"
 )
@@ -110,3 +111,32 @@ func TestBackoffRetry_Success(t *testing.T) {
 	resultExpected := 1
 	f(retryFunc, resultExpected)
 }
+
+func TestBackoff_New(t *testing.T) {
+	f := func(retries int, factor float64, minDuration time.Duration, errExpected string) {
+		t.Helper()
+
+		_, err := New(retries, factor, minDuration)
+		if err == nil {
+			if errExpected != "" {
+				t.Fatalf("expecting non-nil error")
+			}
+			return
+		}
+		if !strings.Contains(err.Error(), errExpected) {
+			t.Fatalf("unexpected error: got %q; want %q", err.Error(), errExpected)
+		}
+	}
+
+	// empty retries
+	f(0, 1.1, time.Millisecond*10, "retries must be greater than 0")
+
+	// empty factor
+	f(1, 0, time.Millisecond*10, "factor must be greater than 1")
+
+	// empty minDuration
+	f(1, 1.1, 0, "minimum duration must be greater than 0")
+
+	// no errors
+	f(1, 1.1, time.Millisecond*10, "")
+}
--- a/app/vmctl/flags.go
+++ b/app/vmctl/flags.go
@@ -56,6 +56,10 @@ const (
 	vmRateLimit  = "vm-rate-limit"

 	vmInterCluster = "vm-intercluster"
+
+	vmBackoffRetries     = "vm-backoff-retries"
+	vmBackoffFactor      = "vm-backoff-factor"
+	vmBackoffMinDuration = "vm-backoff-min-duration"
 )

 var (
@@ -146,6 +150,21 @@ var (
 			Usage: "Whether to skip tls verification when connecting to '--vmAddr'",
 			Value: false,
 		},
+		&cli.IntFlag{
+			Name:  vmBackoffRetries,
+			Value: 10,
+			Usage: "How many import retries to perform before giving up.",
+		},
+		&cli.Float64Flag{
+			Name:  vmBackoffFactor,
+			Value: 1.8,
+			Usage: "Factor to multiply the base duration after each failed import retry. Must be greater than 1.0",
+		},
+		&cli.DurationFlag{
+			Name:  vmBackoffMinDuration,
+			Value: time.Second * 2,
+			Usage: "Minimum duration to wait before the first import retry. Each subsequent import retry will be multiplied by the '--vm-backoff-factor'.",
+		},
 	}
 )

@@ -430,6 +449,10 @@ const (
 	vmNativeDstCAFile             = "vm-native-dst-ca-file"
 	vmNativeDstServerName         = "vm-native-dst-server-name"
 	vmNativeDstInsecureSkipVerify = "vm-native-dst-insecure-skip-verify"
+
+	vmNativeBackoffRetries     = "vm-native-backoff-retries"
+	vmNativeBackoffFactor      = "vm-native-backoff-factor"
+	vmNativeBackoffMinDuration = "vm-native-backoff-min-duration"
 )

 var (
@@ -599,6 +622,21 @@ var (
 				"Non-binary export/import API is less efficient, but supports deduplication if it is configured on vm-native-src-addr side.",
 			Value: false,
 		},
+		&cli.IntFlag{
+			Name:  vmNativeBackoffRetries,
+			Value: 10,
+			Usage: "How many export/import retries to perform before giving up.",
+		},
+		&cli.Float64Flag{
+			Name:  vmNativeBackoffFactor,
+			Value: 1.8,
+			Usage: "Factor to multiply the base duration after each failed export/import retry. Must be greater than 1.0",
+		},
+		&cli.DurationFlag{
+			Name:  vmNativeBackoffMinDuration,
+			Value: time.Second * 2,
+			Usage: "Minimum duration to wait before the first export/import retry. Each subsequent export/import retry will be multiplied by the '--vm-native-backoff-factor'.",
+		},
 	}
 )

--- a/app/vmctl/main.go
+++ b/app/vmctl/main.go
@@ -68,7 +68,7 @@ func main() {

 					tr, err := httputils.Transport(addr, certFile, keyFile, caFile, serverName, insecureSkipVerify)
 					if err != nil {
-						return fmt.Errorf("failed to create Transport: %s", err)
+						return fmt.Errorf("failed to create transport for -%s=%q: %s", otsdbAddr, addr, err)
 					}
 					oCfg := opentsdb.Config{
 						Addr:       addr,
@@ -90,6 +90,7 @@ func main() {
 					if err != nil {
 						return fmt.Errorf("failed to init VM configuration: %s", err)
 					}
+
 					importer, err := vm.NewImporter(ctx, vmCfg)
 					if err != nil {
 						return fmt.Errorf("failed to create VM importer: %s", err)
@@ -143,6 +144,7 @@ func main() {
 					if err != nil {
 						return fmt.Errorf("failed to init VM configuration: %s", err)
 					}
+
 					importer, err = vm.NewImporter(ctx, vmCfg)
 					if err != nil {
 						return fmt.Errorf("failed to create VM importer: %s", err)
@@ -178,7 +180,7 @@ func main() {

 					tr, err := httputils.Transport(addr, certFile, keyFile, caFile, serverName, insecureSkipVerify)
 					if err != nil {
-						return fmt.Errorf("failed to create transport: %s", err)
+						return fmt.Errorf("failed to create transport for -%s=%q: %s", remoteReadSrcAddr, addr, err)
 					}

 					rr, err := remoteread.NewClient(remoteread.Config{
@@ -201,6 +203,7 @@ func main() {
 					if err != nil {
 						return fmt.Errorf("failed to init VM configuration: %s", err)
 					}
+
 					importer, err := vm.NewImporter(ctx, vmCfg)
 					if err != nil {
 						return fmt.Errorf("failed to create VM importer: %s", err)
@@ -233,6 +236,7 @@ func main() {
 					if err != nil {
 						return fmt.Errorf("failed to init VM configuration: %s", err)
 					}
+
 					importer, err = vm.NewImporter(ctx, vmCfg)
 					if err != nil {
 						return fmt.Errorf("failed to create VM importer: %s", err)
@@ -272,6 +276,14 @@ func main() {
 						return fmt.Errorf("flag %q can't be empty", vmNativeFilterMatch)
 					}

+					bfRetries := c.Int(vmNativeBackoffRetries)
+					bfFactor := c.Float64(vmNativeBackoffFactor)
+					bfMinDuration := c.Duration(vmNativeBackoffMinDuration)
+					bf, err := backoff.New(bfRetries, bfFactor, bfMinDuration)
+					if err != nil {
+						return fmt.Errorf("failed to create backoff object: %s", err)
+					}
+
 					disableKeepAlive := c.Bool(vmNativeDisableHTTPKeepAlive)

 					var srcExtraLabels []string
@@ -350,7 +362,7 @@ func main() {
 							ExtraLabels: dstExtraLabels,
 							HTTPClient:  dstHTTPClient,
 						},
-						backoff:                  backoff.New(),
+						backoff:                  bf,
 						cc:                       c.Int(vmConcurrency),
 						disablePerMetricRequests: c.Bool(vmNativeDisablePerMetricMigration),
 						isNative:                 !c.Bool(vmNativeDisableBinaryProtocol),
@@ -426,7 +438,15 @@ func initConfigVM(c *cli.Context) (vm.Config, error) {

 	tr, err := httputils.Transport(addr, certFile, keyFile, caFile, serverName, insecureSkipVerify)
 	if err != nil {
-		return vm.Config{}, fmt.Errorf("failed to create Transport: %s", err)
+		return vm.Config{}, fmt.Errorf("failed to create transport for -%s=%q: %s", vmAddr, addr, err)
+	}
+
+	bfRetries := c.Int(vmBackoffRetries)
+	bfFactor := c.Float64(vmBackoffFactor)
+	bfMinDuration := c.Duration(vmBackoffMinDuration)
+	bf, err := backoff.New(bfRetries, bfFactor, bfMinDuration)
+	if err != nil {
+		return vm.Config{}, fmt.Errorf("failed to create backoff object: %s", err)
 	}

 	return vm.Config{
@@ -442,5 +462,6 @@ func initConfigVM(c *cli.Context) (vm.Config, error) {
 		RoundDigits:        c.Int(vmRoundDigits),
 		ExtraLabels:        c.StringSlice(vmExtraLabel),
 		RateLimit:          c.Int64(vmRateLimit),
+		Backoff:            bf,
 	}, nil
 }
--- a/app/vmctl/remote_read_test.go
+++ b/app/vmctl/remote_read_test.go
@@ -8,6 +8,7 @@ import (

 	"github.com/prometheus/prometheus/prompb"

+	"github.com/VictoriaMetrics/VictoriaMetrics/app/vmctl/backoff"
 	"github.com/VictoriaMetrics/VictoriaMetrics/app/vmctl/barpool"
 	"github.com/VictoriaMetrics/VictoriaMetrics/app/vmctl/remoteread"
 	"github.com/VictoriaMetrics/VictoriaMetrics/app/vmctl/stepper"
@@ -149,6 +150,12 @@ func TestRemoteRead(t *testing.T) {

 			tt.vmCfg.Addr = remoteWriteServer.URL()

+			b, err := backoff.New(10, 1.8, time.Second*2)
+			if err != nil {
+				t.Fatalf("failed to create backoff: %s", err)
+			}
+			tt.vmCfg.Backoff = b
+
 			importer, err := vm.NewImporter(ctx, tt.vmCfg)
 			if err != nil {
 				t.Fatalf("failed to create VM importer: %s", err)
@@ -308,6 +315,12 @@ func TestSteamRemoteRead(t *testing.T) {

 			tt.vmCfg.Addr = remoteWriteServer.URL()

+			b, err := backoff.New(10, 1.8, time.Second*2)
+			if err != nil {
+				t.Fatalf("failed to create backoff: %s", err)
+			}
+
+			tt.vmCfg.Backoff = b
 			importer, err := vm.NewImporter(ctx, tt.vmCfg)
 			if err != nil {
 				t.Fatalf("failed to create VM importer: %s", err)
--- a/app/vmctl/vm/vm.go
+++ b/app/vmctl/vm/vm.go
@@ -54,6 +54,8 @@ type Config struct {
 	// RateLimit defines a data transfer speed in bytes per second.
 	// Is applied to each worker (see Concurrency) independently.
 	RateLimit int64
+	// Backoff defines backoff policy for retries
+	Backoff *backoff.Backoff
 }

 // Importer performs insertion of timeseries
@@ -144,7 +146,7 @@ func NewImporter(ctx context.Context, cfg Config) (*Importer, error) {
 		close:      make(chan struct{}),
 		input:      make(chan *TimeSeries, cfg.Concurrency*4),
 		errors:     make(chan *ImportError, cfg.Concurrency),
-		backoff:    backoff.New(),
+		backoff:    cfg.Backoff,
 	}
 	if err := im.Ping(); err != nil {
 		return nil, fmt.Errorf("ping to %q failed: %s", addr, err)
--- a/app/vmctl/vm_native_test.go
+++ b/app/vmctl/vm_native_test.go
@@ -81,11 +81,16 @@ func TestVMNativeProcessorRun(t *testing.T) {
 		isSilent = true
 		defer func() { isSilent = false }()

+		bf, err := backoff.New(10, 1.8, time.Second*2)
+		if err != nil {
+			t.Fatalf("cannot create backoff: %s", err)
+		}
+
 		p := &vmNativeProcessor{
 			filter:   filter,
 			dst:      dstClient,
 			src:      srcClient,
-			backoff:  backoff.New(),
+			backoff:  bf,
 			cc:       1,
 			isNative: true,
 		}
--- a/app/vminsert/common/insert_ctx_pool.go
+++ b/app/vminsert/common/insert_ctx_pool.go
@@ -2,16 +2,23 @@ package common

 import (
 	"sync"
+
+	"github.com/VictoriaMetrics/VictoriaMetrics/lib/cgroup"
 )

 // GetInsertCtx returns InsertCtx from the pool.
 //
 // Call PutInsertCtx for returning it to the pool.
 func GetInsertCtx() *InsertCtx {
-	if v := insertCtxPool.Get(); v != nil {
-		return v.(*InsertCtx)
+	select {
+	case ctx := <-insertCtxPoolCh:
+		return ctx
+	default:
+		if v := insertCtxPool.Get(); v != nil {
+			return v.(*InsertCtx)
+		}
+		return &InsertCtx{}
 	}
-	return &InsertCtx{}
 }

 // PutInsertCtx returns ctx to the pool.
@@ -19,7 +26,14 @@ func GetInsertCtx() *InsertCtx {
 // ctx cannot be used after the call.
 func PutInsertCtx(ctx *InsertCtx) {
 	ctx.Reset(0)
-	insertCtxPool.Put(ctx)
+	select {
+	case insertCtxPoolCh <- ctx:
+	default:
+		insertCtxPool.Put(ctx)
+	}
 }

-var insertCtxPool sync.Pool
+var (
+	insertCtxPool   sync.Pool
+	insertCtxPoolCh = make(chan *InsertCtx, cgroup.AvailableCPUs())
+)
--- a/app/vminsert/main.go
+++ b/app/vminsert/main.go
@@ -42,6 +42,7 @@ import (
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/protoparser/common"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/protoparser/opentelemetry/firehose"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/storage"
+	"github.com/VictoriaMetrics/VictoriaMetrics/lib/stringsutil"
 )

 var (
@@ -217,6 +218,10 @@ func RequestHandler(w http.ResponseWriter, r *http.Request) bool {
 		addInfluxResponseHeaders(w)
 		influxutils.WriteDatabaseNames(w)
 		return true
+	case "/influx/health":
+		influxHealthRequests.Inc()
+		influxutils.WriteHealthCheckResponse(w)
+		return true
 	case "/opentelemetry/api/v1/push", "/opentelemetry/v1/metrics":
 		opentelemetryPushRequests.Inc()
 		if err := opentelemetry.InsertHandler(r); err != nil {
@@ -343,7 +348,7 @@ func RequestHandler(w http.ResponseWriter, r *http.Request) bool {
 		w.Header().Set("Content-Type", "application/json")
 		var bb bytesutil.ByteBuffer
 		promscrape.WriteConfigData(&bb)
-		fmt.Fprintf(w, `{"status":"success","data":{"yaml":%q}}`, bb.B)
+		fmt.Fprintf(w, `{"status":"success","data":{"yaml":%s}}`, stringsutil.JSONString(string(bb.B)))
 		return true
 	case "/prometheus/-/reload", "/-/reload":
 		if !httpserver.CheckAuthFlag(w, r, reloadAuthKey) {
@@ -396,7 +401,8 @@ var (
 	influxWriteRequests = metrics.NewCounter(`vm_http_requests_total{path="/influx/write", protocol="influx"}`)
 	influxWriteErrors   = metrics.NewCounter(`vm_http_request_errors_total{path="/influx/write", protocol="influx"}`)

-	influxQueryRequests = metrics.NewCounter(`vm_http_requests_total{path="/influx/query", protocol="influx"}`)
+	influxQueryRequests  = metrics.NewCounter(`vm_http_requests_total{path="/influx/query", protocol="influx"}`)
+	influxHealthRequests = metrics.NewCounter(`vm_http_requests_total{path="/influx/health", protocol="influx"}`)

 	datadogv1WriteRequests = metrics.NewCounter(`vm_http_requests_total{path="/datadog/api/v1/series", protocol="datadog"}`)
 	datadogv1WriteErrors   = metrics.NewCounter(`vm_http_request_errors_total{path="/datadog/api/v1/series", protocol="datadog"}`)
--- a/app/vmselect/main.go
+++ b/app/vmselect/main.go
@@ -115,7 +115,7 @@ func RequestHandler(w http.ResponseWriter, r *http.Request) bool {
 	startTime := time.Now()
 	defer requestDuration.UpdateDuration(startTime)
 	tracerEnabled := httputils.GetBool(r, "trace")
-	qt := querytracer.New(tracerEnabled, r.URL.Path)
+	qt := querytracer.New(tracerEnabled, "%s", r.URL.Path)

 	// Limit the number of concurrent queries.
 	select {
--- a/app/vmselect/netstorage/tmp_blocks_file.go
+++ b/app/vmselect/netstorage/tmp_blocks_file.go
@@ -7,6 +7,7 @@ import (
 	"sync"

 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/bytesutil"
+	"github.com/VictoriaMetrics/VictoriaMetrics/lib/flagutil"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/fs"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/memory"
@@ -14,6 +15,10 @@ import (
 	"github.com/VictoriaMetrics/metrics"
 )

+var tmpBufSize = flagutil.NewBytes("search.inmemoryBufSizeBytes", 0, "Size for in-memory data blocks used during processing search requests. "+
+	"By default, the size is automatically calculated based on available memory. "+
+	"Adjust this flag value if you observe that vm_tmp_blocks_max_inmemory_file_size_bytes metric constantly shows much higher values than vm_tmp_blocks_inmemory_file_size_bytes. See https://github.com/VictoriaMetrics/VictoriaMetrics/pull/6851")
+
 // InitTmpBlocksDir initializes directory to store temporary search results.
 //
 // It stores data in system-defined temporary directory if tmpDirPath is empty.
@@ -29,6 +34,9 @@ func InitTmpBlocksDir(tmpDirPath string) {
 var tmpBlocksDir string

 func maxInmemoryTmpBlocksFile() int {
+	if tmpBufSize.IntN() > 0 {
+		return tmpBufSize.IntN()
+	}
 	mem := memory.Allowed()
 	maxLen := mem / 1024
 	if maxLen < 64*1024 {
@@ -40,9 +48,12 @@ func maxInmemoryTmpBlocksFile() int {
 	return maxLen
 }

-var _ = metrics.NewGauge(`vm_tmp_blocks_max_inmemory_file_size_bytes`, func() float64 {
-	return float64(maxInmemoryTmpBlocksFile())
-})
+var (
+	_ = metrics.NewGauge(`vm_tmp_blocks_max_inmemory_file_size_bytes`, func() float64 {
+		return float64(maxInmemoryTmpBlocksFile())
+	})
+	tmpBufSizeSummary = metrics.NewSummary(`vm_tmp_blocks_inmemory_file_size_bytes`)
+)

 type tmpBlocksFile struct {
 	buf []byte
@@ -65,6 +76,8 @@ func getTmpBlocksFile() *tmpBlocksFile {

 func putTmpBlocksFile(tbf *tmpBlocksFile) {
 	tbf.MustClose()
+	bufLen := tbf.Len()
+	tmpBufSizeSummary.Update(float64(bufLen))
 	tbf.buf = tbf.buf[:0]
 	tbf.f = nil
 	tbf.r = nil
@@ -138,7 +151,7 @@ func (tbf *tmpBlocksFile) Finalize() error {
 	tbf.buf = tbf.buf[:0]
 	r := fs.NewReaderAt(tbf.f)

-	// Hint the OS that the file is read almost sequentiallly.
+	// Hint the OS that the file is read almost sequentially.
 	// This should reduce the number of disk seeks, which is important
 	// for HDDs.
 	r.MustFadviseSequentialRead(true)
--- a/app/vmselect/promql/active_queries.go
+++ b/app/vmselect/promql/active_queries.go
@@ -7,6 +7,8 @@ import (
 	"sync"
 	"sync/atomic"
 	"time"
+
+	"github.com/VictoriaMetrics/VictoriaMetrics/lib/stringsutil"
 )

 // ActiveQueriesHandler returns response to /api/v1/status/active_queries
@@ -23,8 +25,8 @@ func ActiveQueriesHandler(w http.ResponseWriter, _ *http.Request) {
 	fmt.Fprintf(w, `{"status":"ok","data":[`)
 	for i, aqe := range aqes {
 		d := now.Sub(aqe.startTime)
-		fmt.Fprintf(w, `{"duration":"%.3fs","id":"%016X","remote_addr":%s,"query":%q,"start":%d,"end":%d,"step":%d}`,
-			d.Seconds(), aqe.qid, aqe.quotedRemoteAddr, aqe.q, aqe.start, aqe.end, aqe.step)
+		fmt.Fprintf(w, `{"duration":"%.3fs","id":"%016X","remote_addr":%s,"query":%s,"start":%d,"end":%d,"step":%d}`,
+			d.Seconds(), aqe.qid, aqe.quotedRemoteAddr, stringsutil.JSONString(aqe.q), aqe.start, aqe.end, aqe.step)
 		if i+1 < len(aqes) {
 			fmt.Fprintf(w, `,`)
 		}
--- a/app/vmselect/promql/transform.go
+++ b/app/vmselect/promql/transform.go
@@ -1052,7 +1052,7 @@ func fixBrokenBuckets(i int, xss []leTimeseries) {

 	// Substitute upper bucket values with lower bucket values if the upper values are NaN
 	// or are bigger than the lower bucket values.
-	vNext := xss[0].ts.Values[0]
+	vNext := xss[0].ts.Values[i]
 	for j := 1; j < len(xss); j++ {
 		v := xss[j].ts.Values[i]
 		if math.IsNaN(v) || vNext > v {
--- a/app/vmselect/promql/transform_test.go
+++ b/app/vmselect/promql/transform_test.go
@@ -39,6 +39,30 @@ func TestFixBrokenBuckets(t *testing.T) {
 	f([]float64{5, 10, 4, 3}, []float64{5, 10, 10, 10})
 }

+func TestFixBrokenBucketsMultipleValues(t *testing.T) {
+	f := func(values, expectedResult [][]float64) {
+		t.Helper()
+		xss := make([]leTimeseries, len(values))
+		for i, v := range values {
+
+			xss[i].ts = &timeseries{
+				Values: v,
+			}
+		}
+		for i := range len(values) - 1 {
+			fixBrokenBuckets(i, xss)
+		}
+		result := make([][]float64, len(values))
+		for i, xs := range xss {
+			result[i] = xs.ts.Values
+		}
+		if !reflect.DeepEqual(result, expectedResult) {
+			t.Fatalf("unexpected result for values=%v\ngot\n%v\nwant\n%v", values, result, expectedResult)
+		}
+	}
+	f([][]float64{{10, 1}, {11, 2}, {13, 3}}, [][]float64{{10, 1}, {11, 2}, {13, 3}})
+}
+
 func TestVmrangeBucketsToLE(t *testing.T) {
 	f := func(buckets, bucketsExpected string) {
 		t.Helper()
--- a/app/vmselect/querystats/querystats.go
+++ b/app/vmselect/querystats/querystats.go
@@ -9,6 +9,7 @@ import (
 	"time"

 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
+	"github.com/VictoriaMetrics/VictoriaMetrics/lib/stringsutil"
 )

 var (
@@ -74,13 +75,13 @@ func initQueryStats() {
 }

 func (qst *queryStatsTracker) writeJSONQueryStats(w io.Writer, topN int, maxLifetime time.Duration) {
-	fmt.Fprintf(w, `{"topN":"%d","maxLifetime":%q,`, topN, maxLifetime)
+	fmt.Fprintf(w, `{"topN":"%d","maxLifetime":"%s",`, topN, maxLifetime)
 	fmt.Fprintf(w, `"search.queryStats.lastQueriesCount":%d,`, *lastQueriesCount)
-	fmt.Fprintf(w, `"search.queryStats.minQueryDuration":%q,`, *minQueryDuration)
+	fmt.Fprintf(w, `"search.queryStats.minQueryDuration":"%s",`, *minQueryDuration)
 	fmt.Fprintf(w, `"topByCount":[`)
 	topByCount := qst.getTopByCount(topN, maxLifetime)
 	for i, r := range topByCount {
-		fmt.Fprintf(w, `{"query":%q,"timeRangeSeconds":%d,"count":%d}`, r.query, r.timeRangeSecs, r.count)
+		fmt.Fprintf(w, `{"query":%s,"timeRangeSeconds":%d,"count":%d}`, stringsutil.JSONString(r.query), r.timeRangeSecs, r.count)
 		if i+1 < len(topByCount) {
 			fmt.Fprintf(w, `,`)
 		}
@@ -88,7 +89,7 @@ func (qst *queryStatsTracker) writeJSONQueryStats(w io.Writer, topN int, maxLife
 	fmt.Fprintf(w, `],"topByAvgDuration":[`)
 	topByAvgDuration := qst.getTopByAvgDuration(topN, maxLifetime)
 	for i, r := range topByAvgDuration {
-		fmt.Fprintf(w, `{"query":%q,"timeRangeSeconds":%d,"avgDurationSeconds":%.3f,"count":%d}`, r.query, r.timeRangeSecs, r.duration.Seconds(), r.count)
+		fmt.Fprintf(w, `{"query":%s,"timeRangeSeconds":%d,"avgDurationSeconds":%.3f,"count":%d}`, stringsutil.JSONString(r.query), r.timeRangeSecs, r.duration.Seconds(), r.count)
 		if i+1 < len(topByAvgDuration) {
 			fmt.Fprintf(w, `,`)
 		}
@@ -96,7 +97,7 @@ func (qst *queryStatsTracker) writeJSONQueryStats(w io.Writer, topN int, maxLife
 	fmt.Fprintf(w, `],"topBySumDuration":[`)
 	topBySumDuration := qst.getTopBySumDuration(topN, maxLifetime)
 	for i, r := range topBySumDuration {
-		fmt.Fprintf(w, `{"query":%q,"timeRangeSeconds":%d,"sumDurationSeconds":%.3f,"count":%d}`, r.query, r.timeRangeSecs, r.duration.Seconds(), r.count)
+		fmt.Fprintf(w, `{"query":%s,"timeRangeSeconds":%d,"sumDurationSeconds":%.3f,"count":%d}`, stringsutil.JSONString(r.query), r.timeRangeSecs, r.duration.Seconds(), r.count)
 		if i+1 < len(topBySumDuration) {
 			fmt.Fprintf(w, `,`)
 		}
--- a/app/vmselect/vmui/asset-manifest.json
+++ b/app/vmselect/vmui/asset-manifest.json
@@ -1,13 +1,13 @@
 {
  "files": {
-    "main.css": "./static/css/main.fce049bf.css",
-    "main.js": "./static/js/main.4b213512.js",
+    "main.css": "./static/css/main.81c6ec3a.css",
+    "main.js": "./static/js/main.9ed27532.js",
    "static/js/685.bebe1265.chunk.js": "./static/js/685.bebe1265.chunk.js",
-    "static/media/MetricsQL.md": "./static/media/MetricsQL.aaabf95f2c9bf356bde4.md",
+    "static/media/MetricsQL.md": "./static/media/MetricsQL.8c2e588d62b87f90dbf0.md",
    "index.html": "./index.html"
  },
  "entrypoints": [
-    "static/css/main.fce049bf.css",
-    "static/js/main.4b213512.js"
+    "static/css/main.81c6ec3a.css",
+    "static/js/main.9ed27532.js"
  ]
 }
--- a/app/vmselect/vmui/index.html
+++ b/app/vmselect/vmui/index.html
@@ -1 +1 @@
-<!doctype html><html lang="en"><head><meta charset="utf-8"/><link rel="icon" href="./favicon.ico"/><meta name="viewport" content="width=device-width,initial-scale=1,maximum-scale=5"/><meta name="theme-color" content="#000000"/><meta name="description" content="UI for VictoriaMetrics"/><link rel="apple-touch-icon" href="./apple-touch-icon.png"/><link rel="icon" type="image/png" sizes="32x32" href="./favicon-32x32.png"><link rel="manifest" href="./manifest.json"/><title>VM UI</title><script src="./dashboards/index.js" type="module"></script><meta name="twitter:card" content="summary_large_image"><meta name="twitter:image" content="./preview.jpg"><meta name="twitter:title" content="UI for VictoriaMetrics"><meta name="twitter:description" content="Explore and troubleshoot your VictoriaMetrics data"><meta name="twitter:site" content="@VictoriaMetrics"><meta property="og:title" content="Metric explorer for VictoriaMetrics"><meta property="og:description" content="Explore and troubleshoot your VictoriaMetrics data"><meta property="og:image" content="./preview.jpg"><meta property="og:type" content="website"><script defer="defer" src="./static/js/main.4b213512.js"></script><link href="./static/css/main.fce049bf.css" rel="stylesheet"></head><body><noscript>You need to enable JavaScript to run this app.</noscript><div id="root"></div></body></html>
+<!doctype html><html lang="en"><head><meta charset="utf-8"/><link rel="icon" href="./favicon.ico"/><meta name="viewport" content="width=device-width,initial-scale=1,maximum-scale=5"/><meta name="theme-color" content="#000000"/><meta name="description" content="UI for VictoriaMetrics"/><link rel="apple-touch-icon" href="./apple-touch-icon.png"/><link rel="icon" type="image/png" sizes="32x32" href="./favicon-32x32.png"><link rel="manifest" href="./manifest.json"/><title>VM UI</title><script src="./dashboards/index.js" type="module"></script><meta name="twitter:card" content="summary_large_image"><meta name="twitter:image" content="./preview.jpg"><meta name="twitter:title" content="UI for VictoriaMetrics"><meta name="twitter:description" content="Explore and troubleshoot your VictoriaMetrics data"><meta name="twitter:site" content="@VictoriaMetrics"><meta property="og:title" content="Metric explorer for VictoriaMetrics"><meta property="og:description" content="Explore and troubleshoot your VictoriaMetrics data"><meta property="og:image" content="./preview.jpg"><meta property="og:type" content="website"><script defer="defer" src="./static/js/main.9ed27532.js"></script><link href="./static/css/main.81c6ec3a.css" rel="stylesheet"></head><body><noscript>You need to enable JavaScript to run this app.</noscript><div id="root"></div></body></html>
--- a/app/vmselect/vmui/static/css/main.81c6ec3a.css
+++ b/app/vmselect/vmui/static/css/main.81c6ec3a.css
--- a/app/vmselect/vmui/static/css/main.fce049bf.css
+++ b/app/vmselect/vmui/static/css/main.fce049bf.css
--- a/app/vmselect/vmui/static/js/main.4b213512.js
+++ b/app/vmselect/vmui/static/js/main.4b213512.js
--- a/app/vmselect/vmui/static/js/main.9ed27532.js
+++ b/app/vmselect/vmui/static/js/main.9ed27532.js
--- a/app/vmselect/vmui/static/js/main.9ed27532.js.LICENSE.txt
+++ b/app/vmselect/vmui/static/js/main.9ed27532.js.LICENSE.txt
@@ -5,7 +5,7 @@
 */

 /**
- * @remix-run/router v1.15.1
+ * @remix-run/router v1.17.0
 *
 * Copyright (c) Remix Software Inc.
 *
@@ -16,7 +16,7 @@
 */

 /**
- * React Router DOM v6.22.1
+ * React Router DOM v6.24.0
 *
 * Copyright (c) Remix Software Inc.
 *
@@ -27,7 +27,7 @@
 */

 /**
- * React Router v6.22.1
+ * React Router v6.24.0
 *
 * Copyright (c) Remix Software Inc.
 *
--- a/app/vmselect/vmui/static/media/MetricsQL.8c2e588d62b87f90dbf0.md
+++ b/app/vmselect/vmui/static/media/MetricsQL.8c2e588d62b87f90dbf0.md
@@ -1,5 +1,4 @@
 ---
-sort: 23
 weight: 23
 title: MetricsQL
 menu:
@@ -10,9 +9,6 @@ aliases:
 - /ExtendedPromQL.html
 - /MetricsQL.html
 ---
-
-# MetricsQL
-
 [VictoriaMetrics](https://github.com/VictoriaMetrics/VictoriaMetrics) implements MetricsQL -
 query language inspired by [PromQL](https://prometheus.io/docs/prometheus/latest/querying/basics/).
 MetricsQL is backwards-compatible with PromQL, so Grafana dashboards backed by Prometheus datasource should work
@@ -220,9 +216,11 @@ See also [descent_over_time](#descent_over_time).
 over [raw samples](https://docs.victoriametrics.com/keyconcepts/#raw-samples) on the given lookbehind window `d` per each time series returned
 from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering).

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 This function is supported by PromQL.

-See also [median_over_time](#median_over_time).
+See also [median_over_time](#median_over_time), [min_over_time](#min_over_time) and [max_over_time](#max_over_time).

 #### changes

@@ -262,6 +260,8 @@ from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#f

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 See also [count_over_time](#count_over_time), [share_eq_over_time](#share_eq_over_time) and [count_values_over_time](#count_values_over_time).

 #### count_gt_over_time
@@ -272,6 +272,8 @@ from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#f

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 See also [count_over_time](#count_over_time) and [share_gt_over_time](#share_gt_over_time).

 #### count_le_over_time
@@ -282,6 +284,8 @@ from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#f

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 See also [count_over_time](#count_over_time) and [share_le_over_time](#share_le_over_time).

 #### count_ne_over_time
@@ -292,7 +296,9 @@ from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#f

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

-See also [count_over_time](#count_over_time).
+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
+See also [count_over_time](#count_over_time) and [count_eq_over_time](#count_eq_over_time).

 #### count_over_time

@@ -313,6 +319,8 @@ The results are calculated independently per each time series returned from the

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 See also [count_eq_over_time](#count_eq_over_time), [count_values](#count_values) and [distinct_over_time](#distinct_over_time) and [label_match](#label_match).

 #### decreases_over_time
@@ -432,6 +440,8 @@ from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#f

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 #### histogram_over_time

 `histogram_over_time(series_selector[d])` is a [rollup function](#rollup-functions), which calculates
@@ -443,11 +453,15 @@ For example, the following query calculates median temperature by country over t

 `histogram_quantile(0.5, sum(histogram_over_time(temperature[24h])) by (vmrange,country))`.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 #### hoeffding_bound_lower

 `hoeffding_bound_lower(phi, series_selector[d])` is a [rollup function](#rollup-functions), which calculates
 lower [Hoeffding bound](https://en.wikipedia.org/wiki/Hoeffding%27s_inequality) for the given `phi` in the range `[0...1]`.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 See also [hoeffding_bound_upper](#hoeffding_bound_upper).

 #### hoeffding_bound_upper
@@ -455,6 +469,8 @@ See also [hoeffding_bound_upper](#hoeffding_bound_upper).
 `hoeffding_bound_upper(phi, series_selector[d])` is a [rollup function](#rollup-functions), which calculates
 upper [Hoeffding bound](https://en.wikipedia.org/wiki/Hoeffding%27s_inequality) for the given `phi` in the range `[0...1]`.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 See also [hoeffding_bound_lower](#hoeffding_bound_lower).

 #### holt_winters
@@ -462,8 +478,9 @@ See also [hoeffding_bound_lower](#hoeffding_bound_lower).
 `holt_winters(series_selector[d], sf, tf)` is a [rollup function](#rollup-functions), which calculates Holt-Winters value
 (aka [double exponential smoothing](https://en.wikipedia.org/wiki/Exponential_smoothing#Double_exponential_smoothing)) for [raw samples](https://docs.victoriametrics.com/keyconcepts/#raw-samples)
 over the given lookbehind window `d` using the given smoothing factor `sf` and the given trend factor `tf`.
-Both `sf` and `tf` must be in the range `[0...1]`. It is expected that the [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering)
-returns time series of [gauge type](https://docs.victoriametrics.com/keyconcepts/#gauge).
+Both `sf` and `tf` must be in the range `[0...1]`.
+
+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).

 This function is supported by PromQL.

@@ -495,13 +512,14 @@ See also [deriv](#deriv).

 `increase(series_selector[d])` is a [rollup function](#rollup-functions), which calculates the increase over the given lookbehind window `d`
 per each time series returned from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering).
-It is expected that the `series_selector` returns time series of [counter type](https://docs.victoriametrics.com/keyconcepts/#counter).

 Unlike Prometheus, it takes into account the last sample before the given lookbehind window `d` when calculating the result.
 See [this article](https://medium.com/@romanhavronenko/victoriametrics-promql-compliance-d4318203f51e) for details.

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [counters](https://docs.victoriametrics.com/keyconcepts/#counter).
+
 This function is supported by PromQL.

 See also [increase_pure](#increase_pure), [increase_prometheus](#increase_prometheus) and [delta](#delta).
@@ -510,12 +528,13 @@ See also [increase_pure](#increase_pure), [increase_prometheus](#increase_promet

 `increase_prometheus(series_selector[d])` is a [rollup function](#rollup-functions), which calculates the increase
 over the given lookbehind window `d` per each time series returned from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering).
-It is expected that the `series_selector` returns time series of [counter type](https://docs.victoriametrics.com/keyconcepts/#counter).
 It doesn't take into account the last sample before the given lookbehind window `d` when calculating the result in the same way as Prometheus does.
 See [this article](https://medium.com/@romanhavronenko/victoriametrics-promql-compliance-d4318203f51e) for details.

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [counters](https://docs.victoriametrics.com/keyconcepts/#counter).
+
 See also [increase_pure](#increase_pure) and [increase](#increase).

 #### increase_pure
@@ -524,6 +543,10 @@ See also [increase_pure](#increase_pure) and [increase](#increase).
 of the following corner case - it assumes that [counters](https://docs.victoriametrics.com/keyconcepts/#counter) always start from 0,
 while [increase](#increase) ignores the first value in a series if it is too big.

+This function is usually applied to [counters](https://docs.victoriametrics.com/keyconcepts/#counter).
+
+See also [increase](#increase) and [increase_prometheus](#increase_prometheus).
+
 #### increases_over_time

 `increases_over_time(series_selector[d])` is a [rollup function](#rollup-functions), which calculates the number of [raw sample](https://docs.victoriametrics.com/keyconcepts/#raw-samples)
@@ -540,15 +563,18 @@ on the given lookbehind window `d` per each time series returned from the given

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 #### irate

 `irate(series_selector[d])` is a [rollup function](#rollup-functions), which calculates the "instant" per-second increase rate over
 the last two [raw samples](https://docs.victoriametrics.com/keyconcepts/#raw-samples)
 on the given lookbehind window `d` per each time series returned from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering).
-It is expected that the `series_selector` returns time series of [counter type](https://docs.victoriametrics.com/keyconcepts/#counter).

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [counters](https://docs.victoriametrics.com/keyconcepts/#counter).
+
 This function is supported by PromQL.

 See also [rate](#rate) and [rollup_rate](#rollup_rate).
@@ -587,6 +613,8 @@ See also [duration_over_time](#duration_over_time) and [lag](#lag).
 over [raw samples](https://docs.victoriametrics.com/keyconcepts/#raw-samples) on the given lookbehind window `d` per each time series returned
 from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering).

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 See also [mad](#mad), [range_mad](#range_mad) and [outlier_iqr_over_time](#outlier_iqr_over_time).

 #### max_over_time
@@ -594,9 +622,11 @@ See also [mad](#mad), [range_mad](#range_mad) and [outlier_iqr_over_time](#outli
 `max_over_time(series_selector[d])` is a [rollup function](#rollup-functions), which calculates the maximum value over [raw samples](https://docs.victoriametrics.com/keyconcepts/#raw-samples)
 on the given lookbehind window `d` per each time series returned from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering).

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 This function is supported by PromQL.

-See also [tmax_over_time](#tmax_over_time).
+See also [tmax_over_time](#tmax_over_time) and [min_over_time](#min_over_time).

 #### median_over_time

@@ -604,6 +634,8 @@ See also [tmax_over_time](#tmax_over_time).
 on the given lookbehind window `d` per each time series returned
 from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering).

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 See also [avg_over_time](#avg_over_time).

 #### min_over_time
@@ -611,9 +643,11 @@ See also [avg_over_time](#avg_over_time).
 `min_over_time(series_selector[d])` is a [rollup function](#rollup-functions), which calculates the minimum value over [raw samples](https://docs.victoriametrics.com/keyconcepts/#raw-samples)
 on the given lookbehind window `d` per each time series returned from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering).

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 This function is supported by PromQL.

-See also [tmin_over_time](#tmin_over_time).
+See also [tmin_over_time](#tmin_over_time) and [max_over_time](#max_over_time).

 #### mode_over_time

@@ -622,6 +656,8 @@ for [raw samples](https://docs.victoriametrics.com/keyconcepts/#raw-samples) on
 from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering). It is expected that [raw sample](https://docs.victoriametrics.com/keyconcepts/#raw-samples)
 values are discrete.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 #### outlier_iqr_over_time

 `outlier_iqr_over_time(series_selector[d])` is a [rollup function](#rollup-functions), which returns the last sample on the given lookbehind window `d`
@@ -632,6 +668,8 @@ if its value is either smaller than the `q25-1.5*iqr` or bigger than `q75+1.5*iq
 The `outlier_iqr_over_time()` is useful for detecting anomalies in gauge values based on the previous history of values.
 For example, `outlier_iqr_over_time(memory_usage_bytes[1h])` triggers when `memory_usage_bytes` suddenly goes outside the usual value range for the last hour.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 See also [outliers_iqr](#outliers_iqr).

 #### predict_linear
@@ -659,6 +697,8 @@ This function is supported by PromQL.
 on the given lookbehind window `d` per each time series returned from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering).
 The `phi` value must be in the range `[0...1]`.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 This function is supported by PromQL.

 See also [quantiles_over_time](#quantiles_over_time).
@@ -670,6 +710,8 @@ over [raw samples](https://docs.victoriametrics.com/keyconcepts/#raw-samples) on
 from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering).
 The function returns individual series per each `phi*` with `{phiLabel="phi*"}` label. `phi*` values must be in the range `[0...1]`.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 See also [quantile_over_time](#quantile_over_time).

 #### range_over_time
@@ -680,11 +722,12 @@ E.g. it calculates `max_over_time(series_selector[d]) - min_over_time(series_sel

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 #### rate

 `rate(series_selector[d])` is a [rollup function](#rollup-functions), which calculates the average per-second increase rate
 over the given lookbehind window `d` per each time series returned from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering).
-It is expected that the `series_selector` returns time series of [counter type](https://docs.victoriametrics.com/keyconcepts/#counter).

 If the lookbehind window is skipped in square brackets, then it is automatically calculated as `max(step, scrape_interval)`, where `step` is the query arg value
 passed to [/api/v1/query_range](https://docs.victoriametrics.com/keyconcepts/#range-query) or [/api/v1/query](https://docs.victoriametrics.com/keyconcepts/#instant-query),
@@ -703,6 +746,8 @@ See also [irate](#irate) and [rollup_rate](#rollup_rate).
 on the given lookbehind window `d`. The calculations are performed individually per each time series returned
 from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering).

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

 #### resets
@@ -710,10 +755,11 @@ Metric names are stripped from the resulting rollups. Add [keep_metric_names](#k
 `resets(series_selector[d])` is a [rollup function](#rollup-functions), which returns the number
 of [counter](https://docs.victoriametrics.com/keyconcepts/#counter) resets over the given lookbehind window `d`
 per each time series returned from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering).
-It is expected that the `series_selector` returns time series of [counter type](https://docs.victoriametrics.com/keyconcepts/#counter).

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [counters](https://docs.victoriametrics.com/keyconcepts/#counter).
+
 This function is supported by PromQL.

 #### rollup
@@ -725,6 +771,10 @@ These values are calculated individually per each time series returned from the
 Optional 2nd argument `"min"`, `"max"` or `"avg"` can be passed to keep only one calculation result and without adding a label.
 See also [label_match](#label_match).

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
+See also [rollup_rate](#rollup_rate).
+
 #### rollup_candlestick

 `rollup_candlestick(series_selector[d])` is a [rollup function](#rollup-functions), which calculates `open`, `high`, `low` and `close` values (aka OHLC)
@@ -736,6 +786,8 @@ from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#f
 Optional 2nd argument `"open"`, `"high"` or `"low"` or `"close"` can be passed to keep only one calculation result and without adding a label.
 See also [label_match](#label_match).

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 #### rollup_delta

 `rollup_delta(series_selector[d])` is a [rollup function](#rollup-functions), which calculates differences between adjacent [raw samples](https://docs.victoriametrics.com/keyconcepts/#raw-samples)
@@ -762,6 +814,8 @@ See also [label_match](#label_match).

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+See also [rollup](#rollup) and [rollup_rate](#rollup_rate).
+
 #### rollup_increase

 `rollup_increase(series_selector[d])` is a [rollup function](#rollup-functions), which calculates increases for adjacent [raw samples](https://docs.victoriametrics.com/keyconcepts/#raw-samples)
@@ -774,12 +828,17 @@ See also [label_match](#label_match).

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names. See also [rollup_delta](#rollup_delta).

+This function is usually applied to [counters](https://docs.victoriametrics.com/keyconcepts/#counter).
+
+See also [rollup](#rollup) and [rollup_rate](#rollup_rate).
+
 #### rollup_rate

 `rollup_rate(series_selector[d])` is a [rollup function](#rollup-functions), which calculates per-second change rates
 for adjacent [raw samples](https://docs.victoriametrics.com/keyconcepts/#raw-samples)
 on the given lookbehind window `d` and returns `min`, `max` and `avg` values for the calculated per-second change rates
 and returns them in time series with `rollup="min"`, `rollup="max"` and `rollup="avg"` additional labels.
+The calculations are performed individually per each time series returned from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering).

 See [this article](https://valyala.medium.com/why-irate-from-prometheus-doesnt-capture-spikes-45f9896d7832) in order to understand better
 when to use `rollup_rate()`.
@@ -787,10 +846,12 @@ when to use `rollup_rate()`.
 Optional 2nd argument `"min"`, `"max"` or `"avg"` can be passed to keep only one calculation result and without adding a label.
 See also [label_match](#label_match).

-The calculations are performed individually per each time series returned from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering).
-
 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [counters](https://docs.victoriametrics.com/keyconcepts/#counter).
+
+See also [rollup](#rollup) and [rollup_increase](#rollup_increase).
+
 #### rollup_scrape_interval

 `rollup_scrape_interval(series_selector[d])` is a [rollup function](#rollup-functions), which calculates the interval in seconds between
@@ -824,6 +885,8 @@ This function is useful for calculating SLI and SLO. Example: `share_gt_over_tim

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 See also [share_le_over_time](#share_le_over_time) and [count_gt_over_time](#count_gt_over_time).

 #### share_le_over_time
@@ -838,6 +901,8 @@ the share of time series values for the last 24 hours when memory usage was belo

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 See also [share_gt_over_time](#share_gt_over_time) and [count_le_over_time](#count_le_over_time).

 #### share_eq_over_time
@@ -849,6 +914,8 @@ from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#f

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 See also [count_eq_over_time](#count_eq_over_time).

 #### stale_samples_over_time
@@ -866,6 +933,8 @@ on the given lookbehind window `d` per each time series returned from the given

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 This function is supported by PromQL.

 See also [stdvar_over_time](#stdvar_over_time).
@@ -877,35 +946,43 @@ on the given lookbehind window `d` per each time series returned from the given

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 This function is supported by PromQL.

 See also [stddev_over_time](#stddev_over_time).

 #### sum_eq_over_time

-`sum_eq_over_time(series_selector[d], eq)` is a [rollup function](#rollup-function), which calculates the sum of [raw sample](https://docs.victoriametrics.com/keyconcepts/#raw-samples)
+`sum_eq_over_time(series_selector[d], eq)` is a [rollup function](#rollup-functions), which calculates the sum of [raw sample](https://docs.victoriametrics.com/keyconcepts/#raw-samples)
 values equal to `eq` on the given lookbehind window `d` per each time series returned from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering).

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 See also [sum_over_time](#sum_over_time) and [count_eq_over_time](#count_eq_over_time).

 #### sum_gt_over_time

-`sum_gt_over_time(series_selector[d], gt)` is a [rollup function](#rollup-function), which calculates the sum of [raw sample](https://docs.victoriametrics.com/keyconcepts/#raw-samples)
+`sum_gt_over_time(series_selector[d], gt)` is a [rollup function](#rollup-functions), which calculates the sum of [raw sample](https://docs.victoriametrics.com/keyconcepts/#raw-samples)
 values bigger than `gt` on the given lookbehind window `d` per each time series returned from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering).

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 See also [sum_over_time](#sum_over_time) and [count_gt_over_time](#count_gt_over_time).

 #### sum_le_over_time

-`sum_le_over_time(series_selector[d], le)` is a [rollup function](#rollup-function), which calculates the sum of [raw sample](https://docs.victoriametrics.com/keyconcepts/#raw-samples)
+`sum_le_over_time(series_selector[d], le)` is a [rollup function](#rollup-functions), which calculates the sum of [raw sample](https://docs.victoriametrics.com/keyconcepts/#raw-samples)
 values smaller or equal to `le` on the given lookbehind window `d` per each time series returned from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering).

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 See also [sum_over_time](#sum_over_time) and [count_le_over_time](#count_le_over_time).

 #### sum_over_time
@@ -915,6 +992,8 @@ on the given lookbehind window `d` per each time series returned from the given

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 This function is supported by PromQL.

 #### sum2_over_time
@@ -924,6 +1003,8 @@ values on the given lookbehind window `d` per each time series returned from the

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 #### timestamp

 `timestamp(series_selector[d])` is a [rollup function](#rollup-functions), which returns the timestamp in seconds with millisecond precision
@@ -1001,6 +1082,8 @@ from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#f

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 See also [zscore](#zscore), [range_trim_zscore](#range_trim_zscore) and [outlier_iqr_over_time](#outlier_iqr_over_time).


@@ -2230,7 +2313,8 @@ Any [rollup function](#rollup-functions) for something other than [series select
 Nested rollup functions can be implicit thanks to the [implicit query conversions](#implicit-query-conversions).
 For example, `delta(sum(m))` is implicitly converted to `delta(sum(default_rollup(m))[1i:1i])`, so it becomes a subquery,
 since it contains [default_rollup](#default_rollup) nested into [delta](#delta).
-This behavior can be disabled or logged via cmd-line flags `-search.disableImplicitConversion` and `-search.logImplicitConversion` since v1.101.0.
+This behavior can be disabled or logged via `-search.disableImplicitConversion` and `-search.logImplicitConversion` command-line flags
+starting from [`v1.101.0` release](https://docs.victoriametrics.com/changelog/).

 VictoriaMetrics performs subqueries in the following way:

@@ -2263,5 +2347,6 @@ VictoriaMetrics performs the following implicit conversions for incoming queries
  For example, `avg_over_time(rate(http_requests_total[5m])[1h])` is automatically converted to `avg_over_time(rate(http_requests_total[5m])[1h:1i])`.
 * If something other than [series selector](https://docs.victoriametrics.com/keyconcepts/#filtering)
  is passed to [rollup function](#rollup-functions), then a [subquery](#subqueries) with `1i` lookbehind window and `1i` step is automatically formed.
-  For example, `rate(sum(up))` is automatically converted to `rate((sum(default_rollup(up)))[1i:1i])`. 
-  This behavior can be disabled or logged via cmd-line flags `-search.disableImplicitConversion` and `-search.logImplicitConversion` since v1.101.0.
+  For example, `rate(sum(up))` is automatically converted to `rate((sum(default_rollup(up)))[1i:1i])`.
+  This behavior can be disabled or logged via `-search.disableImplicitConversion` and `-search.logImplicitConversion` command-line flags
+  starting from [`v1.101.0` release](https://docs.victoriametrics.com/changelog/).
--- a/app/vmselect/vmui/victorialogs.html
+++ b/app/vmselect/vmui/victorialogs.html
@@ -0,0 +1,55 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="utf-8"/>
+  <link rel="icon" href="%PUBLIC_URL%/favicon.ico"/>
+  <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=5"/>
+  <meta name="theme-color" content="#000000"/>
+  <meta
+    name="description"
+    content="UI for VictoriaMetrics"
+  />
+  <link rel="apple-touch-icon" href="%PUBLIC_URL%/apple-touch-icon.png"/>
+  <link rel="icon" type="image/png" sizes="32x32" href="%PUBLIC_URL%/favicon-32x32.png">
+  <!--
+    manifest.json provides metadata used when your web app is installed on a
+    user's mobile device or desktop. See https://developers.google.com/web/fundamentals/web-app-manifest/
+  -->
+  <link rel="manifest" href="%PUBLIC_URL%/manifest.json"/>
+  <!--
+    Notice the use of %PUBLIC_URL% in the tags above.
+    It will be replaced with the URL of the `public` folder during the build.
+    Only files inside the `public` folder can be referenced from the HTML.
+
+    Unlike "/favicon.ico" or "favicon.ico", "%PUBLIC_URL%/favicon.ico" will
+    work correctly both with client-side routing and a non-root public URL.
+    Learn how to configure a non-root public URL by running `npm run build`.
+  -->
+  <title>VM UI</title>
+
+  <meta name="twitter:card" content="summary_large_image">
+  <meta name="twitter:image" content="%PUBLIC_URL%/preview.jpg">
+  <meta name="twitter:title" content="UI for VictoriaMetrics">
+  <meta name="twitter:description" content="Explore and troubleshoot your VictoriaMetrics data">
+  <meta name="twitter:site" content="@VictoriaMetrics">
+
+  <meta property="og:title" content="Metric explorer for VictoriaMetrics">
+  <meta property="og:description" content="Explore and troubleshoot your VictoriaMetrics data">
+  <meta property="og:image" content="%PUBLIC_URL%/preview.jpg">
+  <meta property="og:type" content="website">
+</head>
+<body>
+<noscript>You need to enable JavaScript to run this app.</noscript>
+<div id="root"></div>
+<!--
+  This HTML file is a template.
+  If you open it directly in the browser, you will see an empty page.
+
+  You can add webfonts, meta tags, or analytics to this file.
+  The build step will place the bundled scripts into the <body> tag.
+
+  To begin the development, run `npm start` or `yarn start`.
+  To create a production bundle, use `npm run build` or `yarn build`.
+-->
+</body>
+</html>
--- a/app/vmselect/vmui/victoriametrics.html
+++ b/app/vmselect/vmui/victoriametrics.html
@@ -0,0 +1,56 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="utf-8"/>
+  <link rel="icon" href="%PUBLIC_URL%/favicon.ico"/>
+  <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=5"/>
+  <meta name="theme-color" content="#000000"/>
+  <meta
+    name="description"
+    content="UI for VictoriaMetrics"
+  />
+  <link rel="apple-touch-icon" href="%PUBLIC_URL%/apple-touch-icon.png"/>
+  <link rel="icon" type="image/png" sizes="32x32" href="%PUBLIC_URL%/favicon-32x32.png">
+  <!--
+    manifest.json provides metadata used when your web app is installed on a
+    user's mobile device or desktop. See https://developers.google.com/web/fundamentals/web-app-manifest/
+  -->
+  <link rel="manifest" href="%PUBLIC_URL%/manifest.json"/>
+  <!--
+    Notice the use of %PUBLIC_URL% in the tags above.
+    It will be replaced with the URL of the `public` folder during the build.
+    Only files inside the `public` folder can be referenced from the HTML.
+
+    Unlike "/favicon.ico" or "favicon.ico", "%PUBLIC_URL%/favicon.ico" will
+    work correctly both with client-side routing and a non-root public URL.
+    Learn how to configure a non-root public URL by running `npm run build`.
+  -->
+  <title>VM UI</title>
+  <script src="%PUBLIC_URL%/dashboards/index.js" type="module"></script>
+
+  <meta name="twitter:card" content="summary_large_image">
+  <meta name="twitter:image" content="%PUBLIC_URL%/preview.jpg">
+  <meta name="twitter:title" content="UI for VictoriaMetrics">
+  <meta name="twitter:description" content="Explore and troubleshoot your VictoriaMetrics data">
+  <meta name="twitter:site" content="@VictoriaMetrics">
+
+  <meta property="og:title" content="Metric explorer for VictoriaMetrics">
+  <meta property="og:description" content="Explore and troubleshoot your VictoriaMetrics data">
+  <meta property="og:image" content="%PUBLIC_URL%/preview.jpg">
+  <meta property="og:type" content="website">
+</head>
+<body>
+<noscript>You need to enable JavaScript to run this app.</noscript>
+<div id="root"></div>
+<!--
+  This HTML file is a template.
+  If you open it directly in the browser, you will see an empty page.
+
+  You can add webfonts, meta tags, or analytics to this file.
+  The build step will place the bundled scripts into the <body> tag.
+
+  To begin the development, run `npm start` or `yarn start`.
+  To create a production bundle, use `npm run build` or `yarn build`.
+-->
+</body>
+</html>
--- a/app/vmselect/vmui/vmanomaly.html
+++ b/app/vmselect/vmui/vmanomaly.html
@@ -0,0 +1,56 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="utf-8"/>
+  <link rel="icon" href="%PUBLIC_URL%/favicon.ico"/>
+  <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=5"/>
+  <meta name="theme-color" content="#000000"/>
+  <meta
+    name="description"
+    content="UI for VictoriaMetrics"
+  />
+  <link rel="apple-touch-icon" href="%PUBLIC_URL%/apple-touch-icon.png"/>
+  <link rel="icon" type="image/png" sizes="32x32" href="%PUBLIC_URL%/favicon-32x32.png">
+  <!--
+    manifest.json provides metadata used when your web app is installed on a
+    user's mobile device or desktop. See https://developers.google.com/web/fundamentals/web-app-manifest/
+  -->
+  <link rel="manifest" href="%PUBLIC_URL%/manifest.json"/>
+  <!--
+    Notice the use of %PUBLIC_URL% in the tags above.
+    It will be replaced with the URL of the `public` folder during the build.
+    Only files inside the `public` folder can be referenced from the HTML.
+
+    Unlike "/favicon.ico" or "favicon.ico", "%PUBLIC_URL%/favicon.ico" will
+    work correctly both with client-side routing and a non-root public URL.
+    Learn how to configure a non-root public URL by running `npm run build`.
+  -->
+  <title>VM UI</title>
+  <script src="%PUBLIC_URL%/dashboards/index.js" type="module"></script>
+
+  <meta name="twitter:card" content="summary_large_image">
+  <meta name="twitter:image" content="%PUBLIC_URL%/preview.jpg">
+  <meta name="twitter:title" content="UI for VictoriaMetrics">
+  <meta name="twitter:description" content="Explore and troubleshoot your VictoriaMetrics data">
+  <meta name="twitter:site" content="@VictoriaMetrics">
+
+  <meta property="og:title" content="Metric explorer for VictoriaMetrics">
+  <meta property="og:description" content="Explore and troubleshoot your VictoriaMetrics data">
+  <meta property="og:image" content="%PUBLIC_URL%/preview.jpg">
+  <meta property="og:type" content="website">
+</head>
+<body>
+<noscript>You need to enable JavaScript to run this app.</noscript>
+<div id="root"></div>
+<!--
+  This HTML file is a template.
+  If you open it directly in the browser, you will see an empty page.
+
+  You can add webfonts, meta tags, or analytics to this file.
+  The build step will place the bundled scripts into the <body> tag.
+
+  To begin the development, run `npm start` or `yarn start`.
+  To create a production bundle, use `npm run build` or `yarn build`.
+-->
+</body>
+</html>
--- a/app/vmstorage/main.go
+++ b/app/vmstorage/main.go
@@ -21,6 +21,7 @@ import (
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/mergeset"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/querytracer"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/storage"
+	"github.com/VictoriaMetrics/VictoriaMetrics/lib/stringsutil"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/syncwg"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/timeutil"
 )
@@ -153,9 +154,9 @@ func AddRows(mrs []storage.MetricRow) error {
 	}
 	resetResponseCacheIfNeeded(mrs)
 	WG.Add(1)
-	err := Storage.AddRows(mrs, uint8(*precisionBits))
+	Storage.AddRows(mrs, uint8(*precisionBits))
 	WG.Done()
-	return err
+	return nil
 }

 var errReadOnly = errors.New("the storage is in read-only mode; check -storage.minFreeDiskSpaceBytes command-line flag value")
@@ -308,9 +309,9 @@ func RequestHandler(w http.ResponseWriter, r *http.Request) bool {
 			return true
 		}
 		if prometheusCompatibleResponse {
-			fmt.Fprintf(w, `{"status":"success","data":{"name":%q}}`, snapshotPath)
+			fmt.Fprintf(w, `{"status":"success","data":{"name":%s}}`, stringsutil.JSONString(snapshotPath))
 		} else {
-			fmt.Fprintf(w, `{"status":"ok","snapshot":%q}`, snapshotPath)
+			fmt.Fprintf(w, `{"status":"ok","snapshot":%s}`, stringsutil.JSONString(snapshotPath))
 		}
 		return true
 	case "/list":
@@ -636,5 +637,6 @@ func writeStorageMetrics(w io.Writer, strg *storage.Storage) {
 func jsonResponseError(w http.ResponseWriter, err error) {
 	logger.Errorf("%s", err)
 	w.WriteHeader(http.StatusInternalServerError)
-	fmt.Fprintf(w, `{"status":"error","msg":%q}`, err)
+	errStr := err.Error()
+	fmt.Fprintf(w, `{"status":"error","msg":%s}`, stringsutil.JSONString(errStr))
 }
--- a/app/vmui/Dockerfile-web
+++ b/app/vmui/Dockerfile-web
@@ -1,4 +1,4 @@
-FROM golang:1.22.5 AS build-web-stage
+FROM golang:1.23.0 AS build-web-stage
 COPY build /build

 WORKDIR /build
@@ -6,7 +6,7 @@ COPY web/ /build/
 RUN GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build -o web-amd64 github.com/VictoriMetrics/vmui/ && \
    GOOS=windows GOARCH=amd64 CGO_ENABLED=0 go build -o web-windows github.com/VictoriMetrics/vmui/

-FROM alpine:3.20.1
+FROM alpine:3.20.2
 USER root

 COPY --from=build-web-stage /build/web-amd64 /app/web
--- a/app/vmui/packages/vmui/config-overrides.js
+++ b/app/vmui/packages/vmui/config-overrides.js
@@ -1,6 +1,22 @@
 /* eslint-disable */
 const { override, addExternalBabelPlugin, addWebpackAlias, addWebpackPlugin } = require("customize-cra");
 const webpack = require("webpack");
+const fs = require('fs');
+const path = require('path');
+
+// This will replace the default check
+const pathIndexHTML = (() => {
+  switch (process.env.REACT_APP_TYPE) {
+    case 'logs':
+      return 'public/victorialogs.html';
+    case 'anomaly':
+      return 'public/vmanomaly.html';
+    default:
+      return 'public/victoriametrics.html';
+  }
+})();
+const fileContent = fs.readFileSync(path.resolve(__dirname, pathIndexHTML), 'utf8');
+fs.writeFileSync(path.resolve(__dirname, 'public/index.html'), fileContent);

 module.exports = override(
  addExternalBabelPlugin("@babel/plugin-proposal-nullish-coalescing-operator"),
--- a/app/vmui/packages/vmui/public/index.html
+++ b/app/vmui/packages/vmui/public/index.html
@@ -1,56 +0,0 @@
-<!DOCTYPE html>
-<html lang="en">
-  <head>
-    <meta charset="utf-8" />
-    <link rel="icon" href="%PUBLIC_URL%/favicon.ico" />
-    <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=5" />
-    <meta name="theme-color" content="#000000" />
-    <meta
-      name="description"
-      content="UI for VictoriaMetrics"
-    />
-    <link rel="apple-touch-icon" href="%PUBLIC_URL%/apple-touch-icon.png" />
-    <link rel="icon" type="image/png" sizes="32x32" href="%PUBLIC_URL%/favicon-32x32.png">
-    <!--
-      manifest.json provides metadata used when your web app is installed on a
-      user's mobile device or desktop. See https://developers.google.com/web/fundamentals/web-app-manifest/
-    -->
-    <link rel="manifest" href="%PUBLIC_URL%/manifest.json" />
-    <!--
-      Notice the use of %PUBLIC_URL% in the tags above.
-      It will be replaced with the URL of the `public` folder during the build.
-      Only files inside the `public` folder can be referenced from the HTML.
-
-      Unlike "/favicon.ico" or "favicon.ico", "%PUBLIC_URL%/favicon.ico" will
-      work correctly both with client-side routing and a non-root public URL.
-      Learn how to configure a non-root public URL by running `npm run build`.
-    -->
-    <title>VM UI</title>
-    <script src="%PUBLIC_URL%/dashboards/index.js" type="module"></script>
-
-    <meta name="twitter:card" content="summary_large_image">
-    <meta name="twitter:image" content="%PUBLIC_URL%/preview.jpg">
-    <meta name="twitter:title" content="UI for VictoriaMetrics">
-    <meta name="twitter:description" content="Explore and troubleshoot your VictoriaMetrics data">
-    <meta name="twitter:site" content="@VictoriaMetrics">
-
-    <meta property="og:title" content="Metric explorer for VictoriaMetrics">
-    <meta property="og:description" content="Explore and troubleshoot your VictoriaMetrics data">
-    <meta property="og:image" content="%PUBLIC_URL%/preview.jpg">
-    <meta property="og:type" content="website">
-  </head>
-  <body>
-    <noscript>You need to enable JavaScript to run this app.</noscript>
-    <div id="root"></div>
-    <!--
-      This HTML file is a template.
-      If you open it directly in the browser, you will see an empty page.
-
-      You can add webfonts, meta tags, or analytics to this file.
-      The build step will place the bundled scripts into the <body> tag.
-
-      To begin the development, run `npm start` or `yarn start`.
-      To create a production bundle, use `npm run build` or `yarn build`.
-    -->
-  </body>
-</html>
--- a/app/vmui/packages/vmui/public/victorialogs.html
+++ b/app/vmui/packages/vmui/public/victorialogs.html
@@ -0,0 +1,55 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="utf-8"/>
+  <link rel="icon" href="%PUBLIC_URL%/favicon.ico"/>
+  <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=5"/>
+  <meta name="theme-color" content="#000000"/>
+  <meta
+    name="description"
+    content="UI for VictoriaMetrics"
+  />
+  <link rel="apple-touch-icon" href="%PUBLIC_URL%/apple-touch-icon.png"/>
+  <link rel="icon" type="image/png" sizes="32x32" href="%PUBLIC_URL%/favicon-32x32.png">
+  <!--
+    manifest.json provides metadata used when your web app is installed on a
+    user's mobile device or desktop. See https://developers.google.com/web/fundamentals/web-app-manifest/
+  -->
+  <link rel="manifest" href="%PUBLIC_URL%/manifest.json"/>
+  <!--
+    Notice the use of %PUBLIC_URL% in the tags above.
+    It will be replaced with the URL of the `public` folder during the build.
+    Only files inside the `public` folder can be referenced from the HTML.
+
+    Unlike "/favicon.ico" or "favicon.ico", "%PUBLIC_URL%/favicon.ico" will
+    work correctly both with client-side routing and a non-root public URL.
+    Learn how to configure a non-root public URL by running `npm run build`.
+  -->
+  <title>VM UI</title>
+
+  <meta name="twitter:card" content="summary_large_image">
+  <meta name="twitter:image" content="%PUBLIC_URL%/preview.jpg">
+  <meta name="twitter:title" content="UI for VictoriaMetrics">
+  <meta name="twitter:description" content="Explore and troubleshoot your VictoriaMetrics data">
+  <meta name="twitter:site" content="@VictoriaMetrics">
+
+  <meta property="og:title" content="Metric explorer for VictoriaMetrics">
+  <meta property="og:description" content="Explore and troubleshoot your VictoriaMetrics data">
+  <meta property="og:image" content="%PUBLIC_URL%/preview.jpg">
+  <meta property="og:type" content="website">
+</head>
+<body>
+<noscript>You need to enable JavaScript to run this app.</noscript>
+<div id="root"></div>
+<!--
+  This HTML file is a template.
+  If you open it directly in the browser, you will see an empty page.
+
+  You can add webfonts, meta tags, or analytics to this file.
+  The build step will place the bundled scripts into the <body> tag.
+
+  To begin the development, run `npm start` or `yarn start`.
+  To create a production bundle, use `npm run build` or `yarn build`.
+-->
+</body>
+</html>
--- a/app/vmui/packages/vmui/public/victoriametrics.html
+++ b/app/vmui/packages/vmui/public/victoriametrics.html
@@ -0,0 +1,56 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="utf-8"/>
+  <link rel="icon" href="%PUBLIC_URL%/favicon.ico"/>
+  <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=5"/>
+  <meta name="theme-color" content="#000000"/>
+  <meta
+    name="description"
+    content="UI for VictoriaMetrics"
+  />
+  <link rel="apple-touch-icon" href="%PUBLIC_URL%/apple-touch-icon.png"/>
+  <link rel="icon" type="image/png" sizes="32x32" href="%PUBLIC_URL%/favicon-32x32.png">
+  <!--
+    manifest.json provides metadata used when your web app is installed on a
+    user's mobile device or desktop. See https://developers.google.com/web/fundamentals/web-app-manifest/
+  -->
+  <link rel="manifest" href="%PUBLIC_URL%/manifest.json"/>
+  <!--
+    Notice the use of %PUBLIC_URL% in the tags above.
+    It will be replaced with the URL of the `public` folder during the build.
+    Only files inside the `public` folder can be referenced from the HTML.
+
+    Unlike "/favicon.ico" or "favicon.ico", "%PUBLIC_URL%/favicon.ico" will
+    work correctly both with client-side routing and a non-root public URL.
+    Learn how to configure a non-root public URL by running `npm run build`.
+  -->
+  <title>VM UI</title>
+  <script src="%PUBLIC_URL%/dashboards/index.js" type="module"></script>
+
+  <meta name="twitter:card" content="summary_large_image">
+  <meta name="twitter:image" content="%PUBLIC_URL%/preview.jpg">
+  <meta name="twitter:title" content="UI for VictoriaMetrics">
+  <meta name="twitter:description" content="Explore and troubleshoot your VictoriaMetrics data">
+  <meta name="twitter:site" content="@VictoriaMetrics">
+
+  <meta property="og:title" content="Metric explorer for VictoriaMetrics">
+  <meta property="og:description" content="Explore and troubleshoot your VictoriaMetrics data">
+  <meta property="og:image" content="%PUBLIC_URL%/preview.jpg">
+  <meta property="og:type" content="website">
+</head>
+<body>
+<noscript>You need to enable JavaScript to run this app.</noscript>
+<div id="root"></div>
+<!--
+  This HTML file is a template.
+  If you open it directly in the browser, you will see an empty page.
+
+  You can add webfonts, meta tags, or analytics to this file.
+  The build step will place the bundled scripts into the <body> tag.
+
+  To begin the development, run `npm start` or `yarn start`.
+  To create a production bundle, use `npm run build` or `yarn build`.
+-->
+</body>
+</html>
--- a/app/vmui/packages/vmui/public/vmanomaly.html
+++ b/app/vmui/packages/vmui/public/vmanomaly.html
@@ -0,0 +1,56 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="utf-8"/>
+  <link rel="icon" href="%PUBLIC_URL%/favicon.ico"/>
+  <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=5"/>
+  <meta name="theme-color" content="#000000"/>
+  <meta
+    name="description"
+    content="UI for VictoriaMetrics"
+  />
+  <link rel="apple-touch-icon" href="%PUBLIC_URL%/apple-touch-icon.png"/>
+  <link rel="icon" type="image/png" sizes="32x32" href="%PUBLIC_URL%/favicon-32x32.png">
+  <!--
+    manifest.json provides metadata used when your web app is installed on a
+    user's mobile device or desktop. See https://developers.google.com/web/fundamentals/web-app-manifest/
+  -->
+  <link rel="manifest" href="%PUBLIC_URL%/manifest.json"/>
+  <!--
+    Notice the use of %PUBLIC_URL% in the tags above.
+    It will be replaced with the URL of the `public` folder during the build.
+    Only files inside the `public` folder can be referenced from the HTML.
+
+    Unlike "/favicon.ico" or "favicon.ico", "%PUBLIC_URL%/favicon.ico" will
+    work correctly both with client-side routing and a non-root public URL.
+    Learn how to configure a non-root public URL by running `npm run build`.
+  -->
+  <title>VM UI</title>
+  <script src="%PUBLIC_URL%/dashboards/index.js" type="module"></script>
+
+  <meta name="twitter:card" content="summary_large_image">
+  <meta name="twitter:image" content="%PUBLIC_URL%/preview.jpg">
+  <meta name="twitter:title" content="UI for VictoriaMetrics">
+  <meta name="twitter:description" content="Explore and troubleshoot your VictoriaMetrics data">
+  <meta name="twitter:site" content="@VictoriaMetrics">
+
+  <meta property="og:title" content="Metric explorer for VictoriaMetrics">
+  <meta property="og:description" content="Explore and troubleshoot your VictoriaMetrics data">
+  <meta property="og:image" content="%PUBLIC_URL%/preview.jpg">
+  <meta property="og:type" content="website">
+</head>
+<body>
+<noscript>You need to enable JavaScript to run this app.</noscript>
+<div id="root"></div>
+<!--
+  This HTML file is a template.
+  If you open it directly in the browser, you will see an empty page.
+
+  You can add webfonts, meta tags, or analytics to this file.
+  The build step will place the bundled scripts into the <body> tag.
+
+  To begin the development, run `npm start` or `yarn start`.
+  To create a production bundle, use `npm run build` or `yarn build`.
+-->
+</body>
+</html>
--- a/app/vmui/packages/vmui/src/AppAnomaly.tsx
+++ b/app/vmui/packages/vmui/src/AppAnomaly.tsx
@@ -7,7 +7,7 @@ import ExploreAnomaly from "./pages/ExploreAnomaly/ExploreAnomaly";
 import router from "./router";
 import CustomPanel from "./pages/CustomPanel";

-const AppLogs: FC = () => {
+const AppAnomaly: FC = () => {
  const [loadedTheme, setLoadedTheme] = useState(false);

  return <>
@@ -38,4 +38,4 @@ const AppLogs: FC = () => {
  </>;
 };

-export default AppLogs;
+export default AppAnomaly;
--- a/app/vmui/packages/vmui/src/api/types.ts
+++ b/app/vmui/packages/vmui/src/api/types.ts
@@ -38,6 +38,7 @@ export interface Logs {
 export interface LogHits {
  timestamps: string[];
  values: number[];
+  total?: number;
  fields: {
    [key: string]: string;
  };
--- a/app/vmui/packages/vmui/src/assets/MetricsQL.md
+++ b/app/vmui/packages/vmui/src/assets/MetricsQL.md
@@ -1,5 +1,4 @@
 ---
-sort: 23
 weight: 23
 title: MetricsQL
 menu:
@@ -10,9 +9,6 @@ aliases:
 - /ExtendedPromQL.html
 - /MetricsQL.html
 ---
-
-# MetricsQL
-
 [VictoriaMetrics](https://github.com/VictoriaMetrics/VictoriaMetrics) implements MetricsQL -
 query language inspired by [PromQL](https://prometheus.io/docs/prometheus/latest/querying/basics/).
 MetricsQL is backwards-compatible with PromQL, so Grafana dashboards backed by Prometheus datasource should work
@@ -220,9 +216,11 @@ See also [descent_over_time](#descent_over_time).
 over [raw samples](https://docs.victoriametrics.com/keyconcepts/#raw-samples) on the given lookbehind window `d` per each time series returned
 from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering).

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 This function is supported by PromQL.

-See also [median_over_time](#median_over_time).
+See also [median_over_time](#median_over_time), [min_over_time](#min_over_time) and [max_over_time](#max_over_time).

 #### changes

@@ -262,6 +260,8 @@ from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#f

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 See also [count_over_time](#count_over_time), [share_eq_over_time](#share_eq_over_time) and [count_values_over_time](#count_values_over_time).

 #### count_gt_over_time
@@ -272,6 +272,8 @@ from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#f

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 See also [count_over_time](#count_over_time) and [share_gt_over_time](#share_gt_over_time).

 #### count_le_over_time
@@ -282,6 +284,8 @@ from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#f

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 See also [count_over_time](#count_over_time) and [share_le_over_time](#share_le_over_time).

 #### count_ne_over_time
@@ -292,7 +296,9 @@ from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#f

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

-See also [count_over_time](#count_over_time).
+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
+See also [count_over_time](#count_over_time) and [count_eq_over_time](#count_eq_over_time).

 #### count_over_time

@@ -313,6 +319,8 @@ The results are calculated independently per each time series returned from the

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 See also [count_eq_over_time](#count_eq_over_time), [count_values](#count_values) and [distinct_over_time](#distinct_over_time) and [label_match](#label_match).

 #### decreases_over_time
@@ -432,6 +440,8 @@ from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#f

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 #### histogram_over_time

 `histogram_over_time(series_selector[d])` is a [rollup function](#rollup-functions), which calculates
@@ -443,11 +453,15 @@ For example, the following query calculates median temperature by country over t

 `histogram_quantile(0.5, sum(histogram_over_time(temperature[24h])) by (vmrange,country))`.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 #### hoeffding_bound_lower

 `hoeffding_bound_lower(phi, series_selector[d])` is a [rollup function](#rollup-functions), which calculates
 lower [Hoeffding bound](https://en.wikipedia.org/wiki/Hoeffding%27s_inequality) for the given `phi` in the range `[0...1]`.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 See also [hoeffding_bound_upper](#hoeffding_bound_upper).

 #### hoeffding_bound_upper
@@ -455,6 +469,8 @@ See also [hoeffding_bound_upper](#hoeffding_bound_upper).
 `hoeffding_bound_upper(phi, series_selector[d])` is a [rollup function](#rollup-functions), which calculates
 upper [Hoeffding bound](https://en.wikipedia.org/wiki/Hoeffding%27s_inequality) for the given `phi` in the range `[0...1]`.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 See also [hoeffding_bound_lower](#hoeffding_bound_lower).

 #### holt_winters
@@ -462,8 +478,9 @@ See also [hoeffding_bound_lower](#hoeffding_bound_lower).
 `holt_winters(series_selector[d], sf, tf)` is a [rollup function](#rollup-functions), which calculates Holt-Winters value
 (aka [double exponential smoothing](https://en.wikipedia.org/wiki/Exponential_smoothing#Double_exponential_smoothing)) for [raw samples](https://docs.victoriametrics.com/keyconcepts/#raw-samples)
 over the given lookbehind window `d` using the given smoothing factor `sf` and the given trend factor `tf`.
-Both `sf` and `tf` must be in the range `[0...1]`. It is expected that the [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering)
-returns time series of [gauge type](https://docs.victoriametrics.com/keyconcepts/#gauge).
+Both `sf` and `tf` must be in the range `[0...1]`.
+
+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).

 This function is supported by PromQL.

@@ -495,13 +512,14 @@ See also [deriv](#deriv).

 `increase(series_selector[d])` is a [rollup function](#rollup-functions), which calculates the increase over the given lookbehind window `d`
 per each time series returned from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering).
-It is expected that the `series_selector` returns time series of [counter type](https://docs.victoriametrics.com/keyconcepts/#counter).

 Unlike Prometheus, it takes into account the last sample before the given lookbehind window `d` when calculating the result.
 See [this article](https://medium.com/@romanhavronenko/victoriametrics-promql-compliance-d4318203f51e) for details.

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [counters](https://docs.victoriametrics.com/keyconcepts/#counter).
+
 This function is supported by PromQL.

 See also [increase_pure](#increase_pure), [increase_prometheus](#increase_prometheus) and [delta](#delta).
@@ -510,12 +528,13 @@ See also [increase_pure](#increase_pure), [increase_prometheus](#increase_promet

 `increase_prometheus(series_selector[d])` is a [rollup function](#rollup-functions), which calculates the increase
 over the given lookbehind window `d` per each time series returned from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering).
-It is expected that the `series_selector` returns time series of [counter type](https://docs.victoriametrics.com/keyconcepts/#counter).
 It doesn't take into account the last sample before the given lookbehind window `d` when calculating the result in the same way as Prometheus does.
 See [this article](https://medium.com/@romanhavronenko/victoriametrics-promql-compliance-d4318203f51e) for details.

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [counters](https://docs.victoriametrics.com/keyconcepts/#counter).
+
 See also [increase_pure](#increase_pure) and [increase](#increase).

 #### increase_pure
@@ -524,6 +543,10 @@ See also [increase_pure](#increase_pure) and [increase](#increase).
 of the following corner case - it assumes that [counters](https://docs.victoriametrics.com/keyconcepts/#counter) always start from 0,
 while [increase](#increase) ignores the first value in a series if it is too big.

+This function is usually applied to [counters](https://docs.victoriametrics.com/keyconcepts/#counter).
+
+See also [increase](#increase) and [increase_prometheus](#increase_prometheus).
+
 #### increases_over_time

 `increases_over_time(series_selector[d])` is a [rollup function](#rollup-functions), which calculates the number of [raw sample](https://docs.victoriametrics.com/keyconcepts/#raw-samples)
@@ -540,15 +563,18 @@ on the given lookbehind window `d` per each time series returned from the given

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 #### irate

 `irate(series_selector[d])` is a [rollup function](#rollup-functions), which calculates the "instant" per-second increase rate over
 the last two [raw samples](https://docs.victoriametrics.com/keyconcepts/#raw-samples)
 on the given lookbehind window `d` per each time series returned from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering).
-It is expected that the `series_selector` returns time series of [counter type](https://docs.victoriametrics.com/keyconcepts/#counter).

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [counters](https://docs.victoriametrics.com/keyconcepts/#counter).
+
 This function is supported by PromQL.

 See also [rate](#rate) and [rollup_rate](#rollup_rate).
@@ -587,6 +613,8 @@ See also [duration_over_time](#duration_over_time) and [lag](#lag).
 over [raw samples](https://docs.victoriametrics.com/keyconcepts/#raw-samples) on the given lookbehind window `d` per each time series returned
 from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering).

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 See also [mad](#mad), [range_mad](#range_mad) and [outlier_iqr_over_time](#outlier_iqr_over_time).

 #### max_over_time
@@ -594,9 +622,11 @@ See also [mad](#mad), [range_mad](#range_mad) and [outlier_iqr_over_time](#outli
 `max_over_time(series_selector[d])` is a [rollup function](#rollup-functions), which calculates the maximum value over [raw samples](https://docs.victoriametrics.com/keyconcepts/#raw-samples)
 on the given lookbehind window `d` per each time series returned from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering).

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 This function is supported by PromQL.

-See also [tmax_over_time](#tmax_over_time).
+See also [tmax_over_time](#tmax_over_time) and [min_over_time](#min_over_time).

 #### median_over_time

@@ -604,6 +634,8 @@ See also [tmax_over_time](#tmax_over_time).
 on the given lookbehind window `d` per each time series returned
 from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering).

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 See also [avg_over_time](#avg_over_time).

 #### min_over_time
@@ -611,9 +643,11 @@ See also [avg_over_time](#avg_over_time).
 `min_over_time(series_selector[d])` is a [rollup function](#rollup-functions), which calculates the minimum value over [raw samples](https://docs.victoriametrics.com/keyconcepts/#raw-samples)
 on the given lookbehind window `d` per each time series returned from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering).

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 This function is supported by PromQL.

-See also [tmin_over_time](#tmin_over_time).
+See also [tmin_over_time](#tmin_over_time) and [max_over_time](#max_over_time).

 #### mode_over_time

@@ -622,6 +656,8 @@ for [raw samples](https://docs.victoriametrics.com/keyconcepts/#raw-samples) on
 from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering). It is expected that [raw sample](https://docs.victoriametrics.com/keyconcepts/#raw-samples)
 values are discrete.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 #### outlier_iqr_over_time

 `outlier_iqr_over_time(series_selector[d])` is a [rollup function](#rollup-functions), which returns the last sample on the given lookbehind window `d`
@@ -632,6 +668,8 @@ if its value is either smaller than the `q25-1.5*iqr` or bigger than `q75+1.5*iq
 The `outlier_iqr_over_time()` is useful for detecting anomalies in gauge values based on the previous history of values.
 For example, `outlier_iqr_over_time(memory_usage_bytes[1h])` triggers when `memory_usage_bytes` suddenly goes outside the usual value range for the last hour.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 See also [outliers_iqr](#outliers_iqr).

 #### predict_linear
@@ -659,6 +697,8 @@ This function is supported by PromQL.
 on the given lookbehind window `d` per each time series returned from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering).
 The `phi` value must be in the range `[0...1]`.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 This function is supported by PromQL.

 See also [quantiles_over_time](#quantiles_over_time).
@@ -670,6 +710,8 @@ over [raw samples](https://docs.victoriametrics.com/keyconcepts/#raw-samples) on
 from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering).
 The function returns individual series per each `phi*` with `{phiLabel="phi*"}` label. `phi*` values must be in the range `[0...1]`.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 See also [quantile_over_time](#quantile_over_time).

 #### range_over_time
@@ -680,11 +722,12 @@ E.g. it calculates `max_over_time(series_selector[d]) - min_over_time(series_sel

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 #### rate

 `rate(series_selector[d])` is a [rollup function](#rollup-functions), which calculates the average per-second increase rate
 over the given lookbehind window `d` per each time series returned from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering).
-It is expected that the `series_selector` returns time series of [counter type](https://docs.victoriametrics.com/keyconcepts/#counter).

 If the lookbehind window is skipped in square brackets, then it is automatically calculated as `max(step, scrape_interval)`, where `step` is the query arg value
 passed to [/api/v1/query_range](https://docs.victoriametrics.com/keyconcepts/#range-query) or [/api/v1/query](https://docs.victoriametrics.com/keyconcepts/#instant-query),
@@ -703,6 +746,8 @@ See also [irate](#irate) and [rollup_rate](#rollup_rate).
 on the given lookbehind window `d`. The calculations are performed individually per each time series returned
 from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering).

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

 #### resets
@@ -710,10 +755,11 @@ Metric names are stripped from the resulting rollups. Add [keep_metric_names](#k
 `resets(series_selector[d])` is a [rollup function](#rollup-functions), which returns the number
 of [counter](https://docs.victoriametrics.com/keyconcepts/#counter) resets over the given lookbehind window `d`
 per each time series returned from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering).
-It is expected that the `series_selector` returns time series of [counter type](https://docs.victoriametrics.com/keyconcepts/#counter).

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [counters](https://docs.victoriametrics.com/keyconcepts/#counter).
+
 This function is supported by PromQL.

 #### rollup
@@ -725,6 +771,10 @@ These values are calculated individually per each time series returned from the
 Optional 2nd argument `"min"`, `"max"` or `"avg"` can be passed to keep only one calculation result and without adding a label.
 See also [label_match](#label_match).

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
+See also [rollup_rate](#rollup_rate).
+
 #### rollup_candlestick

 `rollup_candlestick(series_selector[d])` is a [rollup function](#rollup-functions), which calculates `open`, `high`, `low` and `close` values (aka OHLC)
@@ -736,6 +786,8 @@ from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#f
 Optional 2nd argument `"open"`, `"high"` or `"low"` or `"close"` can be passed to keep only one calculation result and without adding a label.
 See also [label_match](#label_match).

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 #### rollup_delta

 `rollup_delta(series_selector[d])` is a [rollup function](#rollup-functions), which calculates differences between adjacent [raw samples](https://docs.victoriametrics.com/keyconcepts/#raw-samples)
@@ -762,6 +814,8 @@ See also [label_match](#label_match).

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+See also [rollup](#rollup) and [rollup_rate](#rollup_rate).
+
 #### rollup_increase

 `rollup_increase(series_selector[d])` is a [rollup function](#rollup-functions), which calculates increases for adjacent [raw samples](https://docs.victoriametrics.com/keyconcepts/#raw-samples)
@@ -774,12 +828,17 @@ See also [label_match](#label_match).

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names. See also [rollup_delta](#rollup_delta).

+This function is usually applied to [counters](https://docs.victoriametrics.com/keyconcepts/#counter).
+
+See also [rollup](#rollup) and [rollup_rate](#rollup_rate).
+
 #### rollup_rate

 `rollup_rate(series_selector[d])` is a [rollup function](#rollup-functions), which calculates per-second change rates
 for adjacent [raw samples](https://docs.victoriametrics.com/keyconcepts/#raw-samples)
 on the given lookbehind window `d` and returns `min`, `max` and `avg` values for the calculated per-second change rates
 and returns them in time series with `rollup="min"`, `rollup="max"` and `rollup="avg"` additional labels.
+The calculations are performed individually per each time series returned from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering).

 See [this article](https://valyala.medium.com/why-irate-from-prometheus-doesnt-capture-spikes-45f9896d7832) in order to understand better
 when to use `rollup_rate()`.
@@ -787,10 +846,12 @@ when to use `rollup_rate()`.
 Optional 2nd argument `"min"`, `"max"` or `"avg"` can be passed to keep only one calculation result and without adding a label.
 See also [label_match](#label_match).

-The calculations are performed individually per each time series returned from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering).
-
 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [counters](https://docs.victoriametrics.com/keyconcepts/#counter).
+
+See also [rollup](#rollup) and [rollup_increase](#rollup_increase).
+
 #### rollup_scrape_interval

 `rollup_scrape_interval(series_selector[d])` is a [rollup function](#rollup-functions), which calculates the interval in seconds between
@@ -824,6 +885,8 @@ This function is useful for calculating SLI and SLO. Example: `share_gt_over_tim

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 See also [share_le_over_time](#share_le_over_time) and [count_gt_over_time](#count_gt_over_time).

 #### share_le_over_time
@@ -838,6 +901,8 @@ the share of time series values for the last 24 hours when memory usage was belo

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 See also [share_gt_over_time](#share_gt_over_time) and [count_le_over_time](#count_le_over_time).

 #### share_eq_over_time
@@ -849,6 +914,8 @@ from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#f

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 See also [count_eq_over_time](#count_eq_over_time).

 #### stale_samples_over_time
@@ -866,6 +933,8 @@ on the given lookbehind window `d` per each time series returned from the given

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 This function is supported by PromQL.

 See also [stdvar_over_time](#stdvar_over_time).
@@ -877,35 +946,43 @@ on the given lookbehind window `d` per each time series returned from the given

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 This function is supported by PromQL.

 See also [stddev_over_time](#stddev_over_time).

 #### sum_eq_over_time

-`sum_eq_over_time(series_selector[d], eq)` is a [rollup function](#rollup-function), which calculates the sum of [raw sample](https://docs.victoriametrics.com/keyconcepts/#raw-samples)
+`sum_eq_over_time(series_selector[d], eq)` is a [rollup function](#rollup-functions), which calculates the sum of [raw sample](https://docs.victoriametrics.com/keyconcepts/#raw-samples)
 values equal to `eq` on the given lookbehind window `d` per each time series returned from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering).

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 See also [sum_over_time](#sum_over_time) and [count_eq_over_time](#count_eq_over_time).

 #### sum_gt_over_time

-`sum_gt_over_time(series_selector[d], gt)` is a [rollup function](#rollup-function), which calculates the sum of [raw sample](https://docs.victoriametrics.com/keyconcepts/#raw-samples)
+`sum_gt_over_time(series_selector[d], gt)` is a [rollup function](#rollup-functions), which calculates the sum of [raw sample](https://docs.victoriametrics.com/keyconcepts/#raw-samples)
 values bigger than `gt` on the given lookbehind window `d` per each time series returned from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering).

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 See also [sum_over_time](#sum_over_time) and [count_gt_over_time](#count_gt_over_time).

 #### sum_le_over_time

-`sum_le_over_time(series_selector[d], le)` is a [rollup function](#rollup-function), which calculates the sum of [raw sample](https://docs.victoriametrics.com/keyconcepts/#raw-samples)
+`sum_le_over_time(series_selector[d], le)` is a [rollup function](#rollup-functions), which calculates the sum of [raw sample](https://docs.victoriametrics.com/keyconcepts/#raw-samples)
 values smaller or equal to `le` on the given lookbehind window `d` per each time series returned from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#filtering).

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 See also [sum_over_time](#sum_over_time) and [count_le_over_time](#count_le_over_time).

 #### sum_over_time
@@ -915,6 +992,8 @@ on the given lookbehind window `d` per each time series returned from the given

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 This function is supported by PromQL.

 #### sum2_over_time
@@ -924,6 +1003,8 @@ values on the given lookbehind window `d` per each time series returned from the

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 #### timestamp

 `timestamp(series_selector[d])` is a [rollup function](#rollup-functions), which returns the timestamp in seconds with millisecond precision
@@ -1001,6 +1082,8 @@ from the given [series_selector](https://docs.victoriametrics.com/keyconcepts/#f

 Metric names are stripped from the resulting rollups. Add [keep_metric_names](#keep_metric_names) modifier in order to keep metric names.

+This function is usually applied to [gauges](https://docs.victoriametrics.com/keyconcepts/#gauge).
+
 See also [zscore](#zscore), [range_trim_zscore](#range_trim_zscore) and [outlier_iqr_over_time](#outlier_iqr_over_time).


@@ -2230,7 +2313,8 @@ Any [rollup function](#rollup-functions) for something other than [series select
 Nested rollup functions can be implicit thanks to the [implicit query conversions](#implicit-query-conversions).
 For example, `delta(sum(m))` is implicitly converted to `delta(sum(default_rollup(m))[1i:1i])`, so it becomes a subquery,
 since it contains [default_rollup](#default_rollup) nested into [delta](#delta).
-This behavior can be disabled or logged via cmd-line flags `-search.disableImplicitConversion` and `-search.logImplicitConversion` since v1.101.0.
+This behavior can be disabled or logged via `-search.disableImplicitConversion` and `-search.logImplicitConversion` command-line flags
+starting from [`v1.101.0` release](https://docs.victoriametrics.com/changelog/).

 VictoriaMetrics performs subqueries in the following way:

@@ -2263,5 +2347,6 @@ VictoriaMetrics performs the following implicit conversions for incoming queries
  For example, `avg_over_time(rate(http_requests_total[5m])[1h])` is automatically converted to `avg_over_time(rate(http_requests_total[5m])[1h:1i])`.
 * If something other than [series selector](https://docs.victoriametrics.com/keyconcepts/#filtering)
  is passed to [rollup function](#rollup-functions), then a [subquery](#subqueries) with `1i` lookbehind window and `1i` step is automatically formed.
-  For example, `rate(sum(up))` is automatically converted to `rate((sum(default_rollup(up)))[1i:1i])`. 
-  This behavior can be disabled or logged via cmd-line flags `-search.disableImplicitConversion` and `-search.logImplicitConversion` since v1.101.0.
+  For example, `rate(sum(up))` is automatically converted to `rate((sum(default_rollup(up)))[1i:1i])`.
+  This behavior can be disabled or logged via `-search.disableImplicitConversion` and `-search.logImplicitConversion` command-line flags
+  starting from [`v1.101.0` release](https://docs.victoriametrics.com/changelog/).
--- a/app/vmui/packages/vmui/src/components/Chart/BarHitsChart/BarHitsChart.tsx
+++ b/app/vmui/packages/vmui/src/components/Chart/BarHitsChart/BarHitsChart.tsx
@@ -1,32 +1,66 @@
-import React, { FC, useRef, useState } from "preact/compat";
+import React, { FC, useMemo, useRef, useState } from "preact/compat";
 import "./style.scss";
 import "uplot/dist/uPlot.min.css";
 import useElementSize from "../../../hooks/useElementSize";
 import uPlot, { AlignedData } from "uplot";
 import { useEffect } from "react";
 import useBarHitsOptions from "./hooks/useBarHitsOptions";
-import TooltipBarHitsChart from "./TooltipBarHitsChart";
+import BarHitsTooltip from "./BarHitsTooltip/BarHitsTooltip";
 import { TimeParams } from "../../../types";
 import usePlotScale from "../../../hooks/uplot/usePlotScale";
 import useReadyChart from "../../../hooks/uplot/useReadyChart";
 import useZoomChart from "../../../hooks/uplot/useZoomChart";
 import classNames from "classnames";
+import { LogHits } from "../../../api/types";
+import { addSeries, delSeries, setBand } from "../../../utils/uplot";
+import { GraphOptions, GRAPH_STYLES } from "./types";
+import BarHitsOptions from "./BarHitsOptions/BarHitsOptions";
+import stack from "../../../utils/uplot/stack";
+import BarHitsLegend from "./BarHitsLegend/BarHitsLegend";

 interface Props {
+  logHits: LogHits[];
  data: AlignedData;
  period: TimeParams;
  setPeriod: ({ from, to }: { from: Date, to: Date }) => void;
+  onApplyFilter: (value: string) => void;
 }
-
-const BarHitsChart: FC<Props> = ({ data, period, setPeriod }) => {
+const BarHitsChart: FC<Props> = ({ logHits, data: _data, period, setPeriod, onApplyFilter }) => {
  const [containerRef, containerSize] = useElementSize();
  const uPlotRef = useRef<HTMLDivElement>(null);
  const [uPlotInst, setUPlotInst] = useState<uPlot>();
+  const [graphOptions, setGraphOptions] = useState<GraphOptions>({
+    graphStyle: GRAPH_STYLES.LINE_STEPPED,
+    stacked: false,
+    fill: false,
+  });

  const { xRange, setPlotScale } = usePlotScale({ period, setPeriod });
  const { onReadyChart, isPanning } = useReadyChart(setPlotScale);
  useZoomChart({ uPlotInst, xRange, setPlotScale });
-  const { options, focusDataIdx } = useBarHitsOptions({ xRange, containerSize, onReadyChart, setPlotScale });
+
+  const { data, bands } = useMemo(() => {
+    return graphOptions.stacked ? stack(_data, () => false) : { data: _data, bands: [] };
+  }, [graphOptions, _data]);
+
+  const { options, series, focusDataIdx } = useBarHitsOptions({
+    data,
+    logHits,
+    bands,
+    xRange,
+    containerSize,
+    onReadyChart,
+    setPlotScale,
+    graphOptions
+  });
+
+  useEffect(() => {
+    if (!uPlotInst) return;
+    delSeries(uPlotInst);
+    addSeries(uPlotInst, series, true);
+    setBand(uPlotInst, series);
+    uPlotInst.redraw();
+  }, [series]);

  useEffect(() => {
    if (!uPlotRef.current) return;
@@ -54,21 +88,31 @@ const BarHitsChart: FC<Props> = ({ data, period, setPeriod }) => {
  }, [data]);

  return (
-    <div
-      className={classNames({
-        "vm-bar-hits-chart": true,
-        "vm-bar-hits-chart_panning": isPanning
-      })}
-      ref={containerRef}
-    >
+    <div className="vm-bar-hits-chart__wrapper">
      <div
-        className="vm-line-chart__u-plot"
-        ref={uPlotRef}
-      />
-      <TooltipBarHitsChart
-        uPlotInst={uPlotInst}
-        focusDataIdx={focusDataIdx}
-      />
+        className={classNames({
+          "vm-bar-hits-chart": true,
+          "vm-bar-hits-chart_panning": isPanning
+        })}
+        ref={containerRef}
+      >
+        <div
+          className="vm-line-chart__u-plot"
+          ref={uPlotRef}
+        />
+        <BarHitsTooltip
+          uPlotInst={uPlotInst}
+          data={_data}
+          focusDataIdx={focusDataIdx}
+        />
+      </div>
+      <BarHitsOptions onChange={setGraphOptions}/>
+      {uPlotInst && (
+        <BarHitsLegend
+          uPlotInst={uPlotInst}
+          onApplyFilter={onApplyFilter}
+        />
+      )}
    </div>
  );
 };
--- a/app/vmui/packages/vmui/src/components/Chart/BarHitsChart/BarHitsLegend/BarHitsLegend.tsx
+++ b/app/vmui/packages/vmui/src/components/Chart/BarHitsChart/BarHitsLegend/BarHitsLegend.tsx
@@ -0,0 +1,68 @@
+import React, { FC, useCallback, useEffect, useState } from "preact/compat";
+import uPlot, { Series } from "uplot";
+import "./style.scss";
+import "../../Line/Legend/style.scss";
+import classNames from "classnames";
+import { MouseEvent } from "react";
+import { isMacOs } from "../../../../utils/detect-device";
+import Tooltip from "../../../Main/Tooltip/Tooltip";
+
+interface Props {
+  uPlotInst: uPlot;
+  onApplyFilter: (value: string) => void;
+}
+
+const BarHitsLegend: FC<Props> = ({ uPlotInst, onApplyFilter }) => {
+  const [series, setSeries] = useState<Series[]>([]);
+
+  const updateSeries = useCallback(() => {
+    const series = uPlotInst.series.filter(s => s.scale !== "x");
+    setSeries(series);
+  }, [uPlotInst]);
+
+  const handleClick = (target: Series) => (e: MouseEvent<HTMLDivElement>) => {
+    const metaKey = e.metaKey || e.ctrlKey;
+    if (!metaKey) {
+      target.show = !target.show;
+    } else {
+      onApplyFilter(target.label || "");
+    }
+
+    updateSeries();
+    uPlotInst.redraw();
+  };
+
+  useEffect(updateSeries, [uPlotInst]);
+
+  return (
+    <div className="vm-bar-hits-legend">
+      {series.map(s => (
+        <Tooltip
+          key={s.label}
+          title={(
+            <ul className="vm-bar-hits-legend-info">
+              <li>Click to {s.show ? "hide" : "show"} the _stream.</li>
+              <li>{isMacOs() ? "Cmd" : "Ctrl"} + Click to filter by the _stream.</li>
+            </ul>
+          )}
+        >
+          <div
+            className={classNames({
+              "vm-bar-hits-legend-item": true,
+              "vm-bar-hits-legend-item_hide": !s.show,
+            })}
+            onClick={handleClick(s)}
+          >
+            <div
+              className="vm-bar-hits-legend-item__marker"
+              style={{ backgroundColor: `${(s?.stroke as () => string)?.()}` }}
+            />
+            <div>{s.label}</div>
+          </div>
+        </Tooltip>
+      ))}
+    </div>
+  );
+};
+
+export default BarHitsLegend;
--- a/app/vmui/packages/vmui/src/components/Chart/BarHitsChart/BarHitsLegend/style.scss
+++ b/app/vmui/packages/vmui/src/components/Chart/BarHitsChart/BarHitsLegend/style.scss
@@ -0,0 +1,35 @@
+@use "src/styles/variables" as *;
+
+.vm-bar-hits-legend {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 0;
+  padding: 0 $padding-small $padding-small;
+
+  &-item {
+    display: grid;
+    grid-template-columns: auto 1fr;
+    align-items: center;
+    gap: 4px;
+    font-size: 12px;
+    padding: $padding-small;
+    border-radius: $border-radius-small;
+    cursor: pointer;
+    transition: 0.2s;
+
+    &:hover {
+      background-color: rgba(0, 0, 0, 0.05);
+    }
+
+    &_hide {
+      text-decoration: line-through;
+      opacity: 0.5;
+    }
+
+    &__marker {
+      width: 14px;
+      height: 14px;
+      border: $color-background-block;
+    }
+  }
+}
--- a/app/vmui/packages/vmui/src/components/Chart/BarHitsChart/BarHitsOptions/BarHitsOptions.tsx
+++ b/app/vmui/packages/vmui/src/components/Chart/BarHitsChart/BarHitsOptions/BarHitsOptions.tsx
@@ -0,0 +1,116 @@
+import React, { FC, useEffect, useMemo, useRef } from "preact/compat";
+import { GraphOptions, GRAPH_STYLES } from "../types";
+import Switch from "../../../Main/Switch/Switch";
+import "./style.scss";
+import useStateSearchParams from "../../../../hooks/useStateSearchParams";
+import { useSearchParams } from "react-router-dom";
+import Button from "../../../Main/Button/Button";
+import classNames from "classnames";
+import { SettingsIcon } from "../../../Main/Icons";
+import Tooltip from "../../../Main/Tooltip/Tooltip";
+import Popper from "../../../Main/Popper/Popper";
+import useBoolean from "../../../../hooks/useBoolean";
+
+interface Props {
+  onChange: (options: GraphOptions) => void;
+}
+
+const BarHitsOptions: FC<Props> = ({ onChange }) => {
+  const [searchParams, setSearchParams] = useSearchParams();
+  const optionsButtonRef = useRef<HTMLDivElement>(null);
+  const {
+    value: openOptions,
+    toggle: toggleOpenOptions,
+    setFalse: handleCloseOptions,
+  } = useBoolean(false);
+
+  const [graphStyle, setGraphStyle] = useStateSearchParams(GRAPH_STYLES.LINE_STEPPED, "graph");
+  const [stacked, setStacked] = useStateSearchParams(false, "stacked");
+  const [fill, setFill] = useStateSearchParams(false, "fill");
+
+  const options: GraphOptions = useMemo(() => ({
+    graphStyle,
+    stacked,
+    fill,
+  }), [graphStyle, stacked, fill]);
+
+  const handleChangeGraphStyle = (val: string) => () => {
+    setGraphStyle(val as GRAPH_STYLES);
+    searchParams.set("graph", val);
+    setSearchParams(searchParams);
+  };
+
+  const handleChangeFill = (val: boolean) => {
+    setFill(val);
+    val ? searchParams.set("fill", "true") : searchParams.delete("fill");
+    setSearchParams(searchParams);
+  };
+
+  const handleChangeStacked = (val: boolean) => {
+    setStacked(val);
+    val ? searchParams.set("stacked", "true") : searchParams.delete("stacked");
+    setSearchParams(searchParams);
+  };
+
+  useEffect(() => {
+    onChange(options);
+  }, [options]);
+
+  return (
+    <div
+      className="vm-bar-hits-options"
+      ref={optionsButtonRef}
+    >
+      <Tooltip title="Graph settings">
+        <Button
+          variant="text"
+          color="primary"
+          startIcon={<SettingsIcon/>}
+          onClick={toggleOpenOptions}
+          ariaLabel="settings"
+        />
+      </Tooltip>
+      <Popper
+        open={openOptions}
+        placement="bottom-right"
+        onClose={handleCloseOptions}
+        buttonRef={optionsButtonRef}
+        title={"Graph settings"}
+      >
+        <div className="vm-bar-hits-options-settings">
+          <div className="vm-bar-hits-options-settings-item vm-bar-hits-options-settings-item_list">
+            <p className="vm-bar-hits-options-settings-item__title">Graph style:</p>
+            {Object.values(GRAPH_STYLES).map(style => (
+              <div
+                key={style}
+                className={classNames({
+                  "vm-list-item": true,
+                  "vm-list-item_active": graphStyle === style,
+                })}
+                onClick={handleChangeGraphStyle(style)}
+              >
+                {style}
+              </div>
+            ))}
+          </div>
+          <div className="vm-bar-hits-options-settings-item">
+            <Switch
+              label={"Stacked"}
+              value={stacked}
+              onChange={handleChangeStacked}
+            />
+          </div>
+          <div className="vm-bar-hits-options-settings-item">
+            <Switch
+              label={"Fill"}
+              value={fill}
+              onChange={handleChangeFill}
+            />
+          </div>
+        </div>
+      </Popper>
+    </div>
+  );
+};
+
+export default BarHitsOptions;
--- a/app/vmui/packages/vmui/src/components/Chart/BarHitsChart/BarHitsOptions/style.scss
+++ b/app/vmui/packages/vmui/src/components/Chart/BarHitsChart/BarHitsOptions/style.scss
@@ -0,0 +1,35 @@
+@use "src/styles/variables" as *;
+
+.vm-bar-hits-options {
+  position: absolute;
+  top: $padding-small;
+  right: $padding-small;
+  z-index: 2;
+
+  &-settings {
+    display: grid;
+    align-items: flex-start;
+    gap: $padding-global;
+    min-width: 200px;
+
+    &-item {
+      border-bottom: $border-divider;
+      padding: 0 $padding-global $padding-global;
+
+      &_list {
+        padding: 0;
+      }
+
+      &__title {
+        font-size: $font-size-small;
+        color: $color-text-secondary;
+        padding: 0 $padding-small $padding-small;
+      }
+
+      &:last-child {
+        border-bottom: none;
+      }
+
+    }
+  }
+}
--- a/app/vmui/packages/vmui/src/components/Chart/BarHitsChart/BarHitsTooltip/BarHitsTooltip.tsx
+++ b/app/vmui/packages/vmui/src/components/Chart/BarHitsChart/BarHitsTooltip/BarHitsTooltip.tsx
@@ -0,0 +1,125 @@
+import React, { FC, useMemo, useRef } from "preact/compat";
+import uPlot, { AlignedData } from "uplot";
+import dayjs from "dayjs";
+import { DATE_TIME_FORMAT } from "../../../../constants/date";
+import classNames from "classnames";
+import "./style.scss";
+import "../../ChartTooltip/style.scss";
+
+interface Props {
+  data: AlignedData;
+  uPlotInst?: uPlot;
+  focusDataIdx: number;
+}
+
+const BarHitsTooltip: FC<Props> = ({ data, focusDataIdx, uPlotInst }) => {
+  const tooltipRef = useRef<HTMLDivElement>(null);
+
+  const tooltipData = useMemo(() => {
+    const series = uPlotInst?.series || [];
+    const [time, ...values] = data.map((d) => d[focusDataIdx] || 0);
+
+    const tooltipItems = values.map((value, i) => {
+      const targetSeries = series[i + 1];
+      const stroke = (targetSeries?.stroke as () => string)?.();
+      const label = targetSeries?.label || "other";
+      const show = targetSeries?.show;
+      return {
+        label,
+        stroke,
+        value,
+        show
+      };
+    }).filter(item => item.value > 0 && item.show).sort((a, b) => b.value - a.value);
+
+    const point = {
+      top: tooltipItems[0] ? uPlotInst?.valToPos?.(tooltipItems[0].value, "y") || 0 : 0,
+      left: uPlotInst?.valToPos?.(time, "x") || 0,
+    };
+
+    return {
+      point,
+      values: tooltipItems,
+      total: tooltipItems.reduce((acc, item) => acc + item.value, 0),
+      timestamp: dayjs(time * 1000).tz().format(DATE_TIME_FORMAT),
+    };
+  }, [focusDataIdx, uPlotInst, data]);
+
+  const tooltipPosition = useMemo(() => {
+    if (!uPlotInst || !tooltipData.total || !tooltipRef.current) return;
+
+    const { top, left } = tooltipData.point;
+    const uPlotPosition = {
+      left: parseFloat(uPlotInst.over.style.left),
+      top: parseFloat(uPlotInst.over.style.top)
+    };
+
+    const {
+      width: uPlotWidth,
+      height: uPlotHeight
+    } = uPlotInst.over.getBoundingClientRect();
+
+    const {
+      width: tooltipWidth,
+      height: tooltipHeight
+    } = tooltipRef.current.getBoundingClientRect();
+
+    const margin = 50;
+    const overflowX = left + tooltipWidth >= uPlotWidth ? tooltipWidth + (2 * margin) : 0;
+    const overflowY = top + tooltipHeight >= uPlotHeight ? tooltipHeight + (2 * margin) : 0;
+
+    const position = {
+      top: top + uPlotPosition.top + margin - overflowY,
+      left: left + uPlotPosition.left + margin - overflowX
+    };
+
+    if (position.left < 0) position.left = 20;
+    if (position.top < 0) position.top = 20;
+
+    return position;
+  }, [tooltipData, uPlotInst, tooltipRef.current]);
+
+  return (
+    <div
+      className={classNames({
+        "vm-chart-tooltip": true,
+        "vm-chart-tooltip_hits": true,
+        "vm-bar-hits-tooltip": true,
+        "vm-bar-hits-tooltip_visible": focusDataIdx !== -1 && tooltipData.values.length
+      })}
+      ref={tooltipRef}
+      style={tooltipPosition}
+    >
+      <div>
+        {tooltipData.values.map((item, i) => (
+          <div
+            className="vm-chart-tooltip-data"
+            key={i}
+          >
+            <span
+              className="vm-chart-tooltip-data__marker"
+              style={{ background: item.stroke }}
+            />
+            <p>
+              {item.label}: <b>{item.value}</b>
+            </p>
+          </div>
+        ))}
+      </div>
+      {tooltipData.values.length > 1 && (
+        <div className="vm-chart-tooltip-data">
+          <p>
+              Total records: <b>{tooltipData.total}</b>
+          </p>
+        </div>
+      )}
+      <div className="vm-chart-tooltip-header">
+        <div className="vm-chart-tooltip-header__title">
+          {tooltipData.timestamp}
+        </div>
+      </div>
+    </div>
+  );
+};
+
+export default BarHitsTooltip;
--- a/app/vmui/packages/vmui/src/components/Chart/BarHitsChart/BarHitsTooltip/style.scss
+++ b/app/vmui/packages/vmui/src/components/Chart/BarHitsChart/BarHitsTooltip/style.scss
@@ -0,0 +1,12 @@
+@use "src/styles/variables" as *;
+
+.vm-bar-hits-tooltip {
+  opacity: 0;
+  pointer-events: none;
+  gap: $padding-small;
+
+  &_visible {
+    opacity: 1;
+    pointer-events: auto;
+  }
+}
--- a/app/vmui/packages/vmui/src/components/Chart/BarHitsChart/TooltipBarHitsChart.tsx
+++ b/app/vmui/packages/vmui/src/components/Chart/BarHitsChart/TooltipBarHitsChart.tsx
@@ -1,89 +0,0 @@
-import React, { FC, useMemo, useRef } from "preact/compat";
-import uPlot from "uplot";
-import dayjs from "dayjs";
-import { DATE_TIME_FORMAT } from "../../../constants/date";
-import classNames from "classnames";
-import "./style.scss";
-import "../../../components/Chart/ChartTooltip/style.scss";
-
-interface Props {
-  uPlotInst?: uPlot;
-  focusDataIdx: number
-}
-
-const TooltipBarHitsChart: FC<Props> = ({ focusDataIdx, uPlotInst }) => {
-  const tooltipRef = useRef<HTMLDivElement>(null);
-
-  const tooltipData = useMemo(() => {
-    const value = uPlotInst?.data?.[1]?.[focusDataIdx];
-    const timestamp = uPlotInst?.data?.[0]?.[focusDataIdx] || 0;
-    const top = uPlotInst?.valToPos?.((value || 0), "y") || 0;
-    const left = uPlotInst?.valToPos?.(timestamp, "x") || 0;
-
-    return {
-      point: { top, left },
-      value,
-      timestamp: dayjs(timestamp * 1000).tz().format(DATE_TIME_FORMAT),
-    };
-  }, [focusDataIdx, uPlotInst]);
-
-  const tooltipPosition = useMemo(() => {
-    if (!uPlotInst || !tooltipData.value || !tooltipRef.current) return;
-
-    const { top, left } = tooltipData.point;
-    const uPlotPosition = {
-      left: parseFloat(uPlotInst.over.style.left),
-      top: parseFloat(uPlotInst.over.style.top)
-    };
-
-    const {
-      width: uPlotWidth,
-      height: uPlotHeight
-    } = uPlotInst.over.getBoundingClientRect();
-
-    const {
-      width: tooltipWidth,
-      height: tooltipHeight
-    } = tooltipRef.current.getBoundingClientRect();
-
-    const margin = 10;
-    const overflowX = left + tooltipWidth >= uPlotWidth ? tooltipWidth + (2 * margin) : 0;
-    const overflowY = top + tooltipHeight >= uPlotHeight ? tooltipHeight + (2 * margin) : 0;
-
-    const position = {
-      top: top + uPlotPosition.top + margin - overflowY,
-      left: left + uPlotPosition.left + margin - overflowX
-    };
-
-    if (position.left < 0) position.left = 20;
-    if (position.top < 0) position.top = 20;
-
-    return position;
-  }, [tooltipData, uPlotInst, tooltipRef.current]);
-
-  return (
-    <div
-      className={classNames({
-        "vm-chart-tooltip": true,
-        "vm-bar-hits-chart-tooltip": true,
-        "vm-bar-hits-chart-tooltip_visible": focusDataIdx !== -1
-      })}
-      ref={tooltipRef}
-      style={tooltipPosition}
-    >
-      <div className="vm-chart-tooltip-data">
-        Count of records:
-        <p className="vm-chart-tooltip-data__value">
-          <b>{tooltipData.value}</b>
-        </p>
-      </div>
-      <div className="vm-chart-tooltip-header">
-        <div className="vm-chart-tooltip-header__title">
-          {tooltipData.timestamp}
-        </div>
-      </div>
-    </div>
-  );
-};
-
-export default TooltipBarHitsChart;
--- a/app/vmui/packages/vmui/src/components/Chart/BarHitsChart/hooks/useBarHitsOptions.ts
+++ b/app/vmui/packages/vmui/src/components/Chart/BarHitsChart/hooks/useBarHitsOptions.ts
@@ -2,42 +2,81 @@ import { useMemo, useState } from "preact/compat";
 import { getAxes, handleDestroy, setSelect } from "../../../../utils/uplot";
 import dayjs from "dayjs";
 import { dateFromSeconds, formatDateForNativeInput } from "../../../../utils/time";
-import uPlot, { Options } from "uplot";
+import uPlot, { AlignedData, Band, Options, Series } from "uplot";
 import { getCssVariable } from "../../../../utils/theme";
-import { barPaths } from "../../../../utils/uplot/bars";
 import { useAppState } from "../../../../state/common/StateContext";
 import { MinMax, SetMinMax } from "../../../../types";
+import { LogHits } from "../../../../api/types";
+import getSeriesPaths from "../../../../utils/uplot/paths";
+import { GraphOptions, GRAPH_STYLES } from "../types";
+
+const seriesColors = [
+  "color-log-hits-bar-1",
+  "color-log-hits-bar-2",
+  "color-log-hits-bar-3",
+  "color-log-hits-bar-4",
+  "color-log-hits-bar-5",
+];
+
+const strokeWidth = {
+  [GRAPH_STYLES.BAR]: 0.8,
+  [GRAPH_STYLES.LINE_STEPPED]: 1.2,
+  [GRAPH_STYLES.LINE]: 1.2,
+  [GRAPH_STYLES.POINTS]: 0,
+};

 interface UseGetBarHitsOptionsArgs {
+  data: AlignedData;
+  logHits: LogHits[];
  xRange: MinMax;
+  bands?: Band[];
  containerSize: { width: number, height: number };
  setPlotScale: SetMinMax;
  onReadyChart: (u: uPlot) => void;
+  graphOptions: GraphOptions;
 }

-const useBarHitsOptions = ({ xRange, containerSize, onReadyChart, setPlotScale }: UseGetBarHitsOptionsArgs) => {
+const useBarHitsOptions = ({
+  data,
+  logHits,
+  xRange,
+  bands,
+  containerSize,
+  onReadyChart,
+  setPlotScale,
+  graphOptions
+}: UseGetBarHitsOptionsArgs) => {
  const { isDarkTheme } = useAppState();

  const [focusDataIdx, setFocusDataIdx] = useState(-1);

-  const series = useMemo(() => [
-    {},
-    {
-      label: "y",
-      width: 1,
-      stroke: getCssVariable("color-log-hits-bar"),
-      fill: getCssVariable("color-log-hits-bar"),
-      paths: barPaths,
-    }
-  ], [isDarkTheme]);
-
  const setCursor = (u: uPlot) => {
    const dataIdx = u.cursor.idx ?? -1;
    setFocusDataIdx(dataIdx);
  };

+  const series: Series[] = useMemo(() => {
+    let colorN = 0;
+    return data.map((_d, i) => {
+      if (i === 0) return {}; // 0 index is xAxis(timestamps)
+      const fields = Object.values(logHits?.[i - 1]?.fields || {});
+      const label = fields.map((value) => value || "\"\"").join(", ");
+      const color = getCssVariable(label ? seriesColors[colorN] : "color-log-hits-bar-0");
+      if (label) colorN++;
+      return {
+        label: label || "other",
+        width: strokeWidth[graphOptions.graphStyle],
+        spanGaps: true,
+        stroke: color,
+        fill: graphOptions.fill ? color + "80" : "",
+        paths: getSeriesPaths(graphOptions.graphStyle),
+      };
+    });
+  }, [isDarkTheme, data, graphOptions]);
+
  const options: Options = useMemo(() => ({
    series,
+    bands,
    width: containerSize.width || (window.innerWidth / 2),
    height: containerSize.height || 200,
    cursor: {
@@ -55,6 +94,7 @@ const useBarHitsOptions = ({ xRange, containerSize, onReadyChart, setPlotScale }
      }
    },
    hooks: {
+      drawSeries: [],
      ready: [onReadyChart],
      setCursor: [setCursor],
      setSelect: [setSelect(setPlotScale)],
@@ -63,10 +103,11 @@ const useBarHitsOptions = ({ xRange, containerSize, onReadyChart, setPlotScale }
    legend: { show: false },
    axes: getAxes([{}, { scale: "y" }]),
    tzDate: ts => dayjs(formatDateForNativeInput(dateFromSeconds(ts))).local().toDate(),
-  }), [isDarkTheme]);
+  }), [isDarkTheme, series, bands]);

  return {
    options,
+    series,
    focusDataIdx,
  };
 };
--- a/app/vmui/packages/vmui/src/components/Chart/BarHitsChart/style.scss
+++ b/app/vmui/packages/vmui/src/components/Chart/BarHitsChart/style.scss
@@ -1,22 +1,18 @@
@use "src/styles/variables" as *;

 .vm-bar-hits-chart {
-  height: 100%;
+  position: relative;
  width: 100%;
+  height: 200px;
+
+  &__wrapper {
+    display: flex;
+    flex-direction: column;
+    width: 100%;
+    height: 100%;
+  }

  &_panning {
    pointer-events: none;
  }
-
-  &-tooltip {
-    opacity: 0;
-    pointer-events: none;
-    width: 240px;
-    gap: $padding-small;
-
-    &_visible {
-      opacity: 1;
-      pointer-events: auto;
-    }
-  }
 }
--- a/app/vmui/packages/vmui/src/components/Chart/BarHitsChart/types.ts
+++ b/app/vmui/packages/vmui/src/components/Chart/BarHitsChart/types.ts
@@ -0,0 +1,12 @@
+export enum GRAPH_STYLES {
+  BAR = "Bars",
+  LINE = "Lines",
+  LINE_STEPPED = "Stepped lines",
+  POINTS = "Points",
+}
+
+export interface GraphOptions {
+  graphStyle: GRAPH_STYLES;
+  stacked: boolean;
+  fill: boolean;
+}
--- a/app/vmui/packages/vmui/src/components/Chart/ChartTooltip/style.scss
+++ b/app/vmui/packages/vmui/src/components/Chart/ChartTooltip/style.scss
@@ -25,6 +25,12 @@ $chart-tooltip-y: -1 * ($padding-global + $chart-tooltip-half-icon);
  user-select: text;
  pointer-events: none;

+  &_hits {
+    white-space: pre-wrap;
+    word-break: break-all;
+    width: auto;
+  }
+
  &_sticky {
    pointer-events: auto;
    z-index: 99;
@@ -74,10 +80,22 @@ $chart-tooltip-y: -1 * ($padding-global + $chart-tooltip-half-icon);
    justify-content: flex-start;
    gap: $padding-small;

+    &_margin-bottom {
+      margin-bottom: $padding-global;
+    }
+
+    &_margin-top {
+      margin-top: $padding-global;
+    }
+
    &__marker {
      width: $font-size;
      height: $font-size;
      border: 1px solid rgba($color-white, 0.5);
+
+      &_tranparent {
+        opacity: 0;
+      }
    }

    &__value {
--- a/app/vmui/packages/vmui/src/components/Configurators/GlobalSettings/GlobalSettings.tsx
+++ b/app/vmui/packages/vmui/src/components/Configurators/GlobalSettings/GlobalSettings.tsx
@@ -13,6 +13,7 @@ import ThemeControl from "../ThemeControl/ThemeControl";
 import useDeviceDetect from "../../../hooks/useDeviceDetect";
 import useBoolean from "../../../hooks/useBoolean";
 import { AppType } from "../../../types/appType";
+import SwitchMarkdownParsing from "../LogsSettings/MarkdownParsing/SwitchMarkdownParsing";

 const title = "Settings";

@@ -60,6 +61,10 @@ const GlobalSettings: FC = () => {
        onClose={handleClose}
      />
    },
+    {
+      show: isLogsApp,
+      component: <SwitchMarkdownParsing/>
+    },
    {
      show: true,
      component: <Timezones ref={timezoneSettingRef}/>
--- a/app/vmui/packages/vmui/src/components/Configurators/GlobalSettings/TenantsConfiguration/TenantsFields.tsx
+++ b/app/vmui/packages/vmui/src/components/Configurators/GlobalSettings/TenantsConfiguration/TenantsFields.tsx
@@ -0,0 +1,150 @@
+import React, { FC, useRef } from "preact/compat";
+import { useTimeDispatch } from "../../../../state/time/TimeStateContext";
+import { ArrowDownIcon, QuestionIcon, StorageIcon } from "../../../Main/Icons";
+import Button from "../../../Main/Button/Button";
+import "./style.scss";
+import "../../TimeRangeSettings/ExecutionControls/style.scss";
+import classNames from "classnames";
+import Popper from "../../../Main/Popper/Popper";
+import { getAppModeEnable } from "../../../../utils/app-mode";
+import Tooltip from "../../../Main/Tooltip/Tooltip";
+import useDeviceDetect from "../../../../hooks/useDeviceDetect";
+import TextField from "../../../Main/TextField/TextField";
+import useBoolean from "../../../../hooks/useBoolean";
+import useStateSearchParams from "../../../../hooks/useStateSearchParams";
+import { useSearchParams } from "react-router-dom";
+import { useEffect } from "react";
+
+const TenantsFields: FC = () => {
+  const appModeEnable = getAppModeEnable();
+  const { isMobile } = useDeviceDetect();
+  const timeDispatch = useTimeDispatch();
+
+  const [searchParams, setSearchParams] = useSearchParams();
+  const [accountID, setAccountID] = useStateSearchParams("0", "accountID");
+  const [projectID, setProjectID] = useStateSearchParams("0", "projectID");
+  const formattedTenant = `${accountID}:${projectID}`;
+
+  const buttonRef = useRef<HTMLDivElement>(null);
+
+  const {
+    value: openPopup,
+    toggle: toggleOpenPopup,
+    setFalse: handleClosePopup,
+  } = useBoolean(false);
+
+  const applyChanges = () => {
+    searchParams.set("accountID", accountID);
+    searchParams.set("projectID", projectID);
+    setSearchParams(searchParams);
+    handleClosePopup();
+    timeDispatch({ type: "RUN_QUERY" });
+  };
+
+  const handleReset = () => {
+    setAccountID(searchParams.get("accountID") || "0");
+    setProjectID(searchParams.get("projectID") || "0");
+  };
+
+  useEffect(() => {
+    if (openPopup) return;
+    handleReset();
+  }, [openPopup]);
+
+  return (
+    <div className="vm-tenant-input">
+      <Tooltip title="Define Tenant ID if you need request to another storage">
+        <div ref={buttonRef}>
+          {isMobile ? (
+            <div
+              className="vm-mobile-option"
+              onClick={toggleOpenPopup}
+            >
+              <span className="vm-mobile-option__icon"><StorageIcon/></span>
+              <div className="vm-mobile-option-text">
+                <span className="vm-mobile-option-text__label">Tenant ID</span>
+                <span className="vm-mobile-option-text__value">{formattedTenant}</span>
+              </div>
+              <span className="vm-mobile-option__arrow"><ArrowDownIcon/></span>
+            </div>
+          ) : (
+            <Button
+              className={appModeEnable ? "" : "vm-header-button"}
+              variant="contained"
+              color="primary"
+              fullWidth
+              startIcon={<StorageIcon/>}
+              endIcon={(
+                <div
+                  className={classNames({
+                    "vm-execution-controls-buttons__arrow": true,
+                    "vm-execution-controls-buttons__arrow_open": openPopup,
+                  })}
+                >
+                  <ArrowDownIcon/>
+                </div>
+              )}
+              onClick={toggleOpenPopup}
+            >
+              {formattedTenant}
+            </Button>
+          )}
+        </div>
+      </Tooltip>
+      <Popper
+        open={openPopup}
+        placement="bottom-right"
+        onClose={handleClosePopup}
+        buttonRef={buttonRef}
+        title={isMobile ? "Define Tenant ID" : undefined}
+      >
+        <div
+          className={classNames({
+            "vm-list vm-tenant-input-list": true,
+            "vm-list vm-tenant-input-list_mobile": isMobile,
+            "vm-tenant-input-list_inline": true,
+          })}
+        >
+          <TextField
+            autofocus
+            label="accountID"
+            value={accountID}
+            onChange={setAccountID}
+            type="number"
+          />
+          <TextField
+            autofocus
+            label="projectID"
+            value={projectID}
+            onChange={setProjectID}
+            type="number"
+          />
+          <div className="vm-tenant-input-list__buttons">
+            <Tooltip title="Multitenancy in VictoriaLogs documentation">
+              <a
+                href="https://docs.victoriametrics.com/victorialogs/#multitenancy"
+                target="_blank"
+                rel="help noreferrer"
+              >
+                <Button
+                  variant="text"
+                  color="gray"
+                  startIcon={<QuestionIcon/>}
+                />
+              </a>
+            </Tooltip>
+            <Button
+              variant="contained"
+              color="primary"
+              onClick={applyChanges}
+            >
+              Apply
+            </Button>
+          </div>
+        </div>
+      </Popper>
+    </div>
+  );
+};
+
+export default TenantsFields;
--- a/app/vmui/packages/vmui/src/components/Configurators/GlobalSettings/TenantsConfiguration/style.scss
+++ b/app/vmui/packages/vmui/src/components/Configurators/GlobalSettings/TenantsConfiguration/style.scss
@@ -17,11 +17,23 @@
      padding: 0 $padding-global $padding-small;
    }

+    &_inline {
+      display: grid;
+      gap: calc($padding-small/2);
+      padding: $padding-global;
+    }
+
    &__search {
      position: sticky;
      top: 0;
      padding: $padding-small $padding-global;
      background-color: $color-background-block;
    }
+
+    &__buttons {
+      display: flex;
+      justify-content: space-between;
+      gap: $padding-small;
+    }
  }
 }
--- a/app/vmui/packages/vmui/src/components/Configurators/GlobalSettings/style.scss
+++ b/app/vmui/packages/vmui/src/components/Configurators/GlobalSettings/style.scss
@@ -4,7 +4,7 @@
  display: flex;
  flex-direction: column;
  align-items: center;
-  gap: $padding-medium;
+  gap: $padding-large;
  width: 600px;
  padding-bottom: $padding-medium;

@@ -39,6 +39,13 @@
    margin-bottom: $padding-global;
  }

+  &__info {
+    padding-top: $padding-small;
+    font-size: $font-size-small;
+    color: $color-text-secondary;
+    line-height: 130%;
+  }
+
  &-url {
    display: flex;
    align-items: flex-start;
--- a/app/vmui/packages/vmui/src/components/Configurators/LogsSettings/MarkdownParsing/SwitchMarkdownParsing.tsx
+++ b/app/vmui/packages/vmui/src/components/Configurators/LogsSettings/MarkdownParsing/SwitchMarkdownParsing.tsx
@@ -0,0 +1,35 @@
+import React, { FC } from "preact/compat";
+import Switch from "../../../Main/Switch/Switch";
+import useDeviceDetect from "../../../../hooks/useDeviceDetect";
+import { useLogsDispatch, useLogsState } from "../../../../state/logsPanel/LogsStateContext";
+
+const SwitchMarkdownParsing: FC = () => {
+  const { isMobile } = useDeviceDetect();
+  const { markdownParsing } = useLogsState();
+  const dispatch = useLogsDispatch();
+
+
+  const handleChangeMarkdownParsing = (val: boolean) => {
+    dispatch({ type: "SET_MARKDOWN_PARSING", payload: val });
+  };
+
+  return (
+    <div>
+      <div className="vm-server-configurator__title">
+        Markdown Parsing for Logs
+      </div>
+      <Switch
+        label={markdownParsing ? "Disable markdown parsing" : "Enable markdown parsing"}
+        value={markdownParsing}
+        onChange={handleChangeMarkdownParsing}
+        fullWidth={isMobile}
+      />
+      <div className="vm-server-configurator__info">
+        Toggle this switch to enable or disable the Markdown formatting for log entries.
+        Enabling this will parse log texts to Markdown.
+      </div>
+    </div>
+  );
+};
+
+export default SwitchMarkdownParsing;
--- a/app/vmui/packages/vmui/src/components/Configurators/QueryEditor/QueryEditorAutocomplete.tsx
+++ b/app/vmui/packages/vmui/src/components/Configurators/QueryEditor/QueryEditorAutocomplete.tsx
@@ -34,14 +34,25 @@ const QueryEditorAutocomplete: FC<QueryEditorAutocompleteProps> = ({
  }, [value, caretPosition]);

  const exprLastPart = useMemo(() => {
-    const parts = values.beforeCursor.split("}");
+    const regexpSplit = /\s(or|and|unless|default|ifnot|if|group_left|group_right)\s|}|\+|\|-|\*|\/|\^/i;
+    const parts = values.beforeCursor.split(regexpSplit);
    return parts[parts.length - 1];
  }, [values]);

  const metric = useMemo(() => {
-    const regexp = /\b[^{}(),\s]+(?={|$)/g;
-    const match = exprLastPart.match(regexp);
-    return match ? match[0] : "";
+    const regex1 = /\w+\((?<metricName>[^)]+)\)\s+(by|without|on|ignoring)\s*\(\w*/gi;
+    const matchAlt = [...exprLastPart.matchAll(regex1)];
+    if (matchAlt.length > 0 && matchAlt[0].groups && matchAlt[0].groups.metricName) {
+      return matchAlt[0].groups.metricName;
+    }
+
+    const regex2 = /^\s*\b(?<metricName>[^{}(),\s]+)(?={|$)/g;
+    const match = [...exprLastPart.matchAll(regex2)];
+    if (match.length > 0 && match[0].groups && match[0].groups.metricName) {
+      return match[0].groups.metricName;
+    }
+
+    return "";
  }, [exprLastPart]);

  const label = useMemo(() => {
@@ -51,7 +62,7 @@ const QueryEditorAutocomplete: FC<QueryEditorAutocompleteProps> = ({
  }, [exprLastPart]);

  const shouldSuppressAutoSuggestion = (value: string) => {
-    const pattern = /([{(),+\-*/^]|\b(?:or|and|unless|default|ifnot|if|group_left|group_right)\b)/;
+    const pattern = /([{(),+\-*/^]|\b(?:or|and|unless|default|ifnot|if|group_left|group_right|by|without|on|ignoring)\b)/i;
    const parts = value.split(/\s+/);
    const partsCount = parts.length;
    const lastPart = parts[partsCount - 1];
@@ -63,12 +74,16 @@ const QueryEditorAutocomplete: FC<QueryEditorAutocompleteProps> = ({
  };

  const context = useMemo(() => {
-    if (!values.beforeCursor || values.beforeCursor.endsWith("}") || shouldSuppressAutoSuggestion(values.beforeCursor)) {
+    const valueBeforeCursor = values.beforeCursor.trim();
+    const endOfClosedBrackets = ["}", ")"].some(char => valueBeforeCursor.endsWith(char));
+    const endOfClosedQuotes = !hasUnclosedQuotes(valueBeforeCursor) && ["`", "'", "\""].some(char => valueBeforeCursor.endsWith(char));
+    if (!values.beforeCursor || endOfClosedBrackets || endOfClosedQuotes || shouldSuppressAutoSuggestion(values.beforeCursor)) {
      return QueryContextType.empty;
    }

-    const labelRegexp = /\{[^}]*$/;
-    const labelValueRegexp = new RegExp(`(${escapeRegexp(metric)})?{?.+${escapeRegexp(label)}(=|!=|=~|!~)"?([^"]*)$`, "g");
+    const labelRegexp = /(?:by|without|on|ignoring)\s*\(\s*[^)]*$|\{[^}]*$/i;
+    const patternLabelValue = `(${escapeRegexp(metric)})?{?.+${escapeRegexp(label)}(=|!=|=~|!~)"?([^"]*)$`;
+    const labelValueRegexp = new RegExp(patternLabelValue, "g");

    switch (true) {
      case labelValueRegexp.test(values.beforeCursor):
@@ -81,7 +96,7 @@ const QueryEditorAutocomplete: FC<QueryEditorAutocompleteProps> = ({
  }, [values, metric, label]);

  const valueByContext = useMemo(() => {
-    const wordMatch = values.beforeCursor.match(/([\w_\-.:/]+(?![},]))$/);
+    const wordMatch = values.beforeCursor.match(/([\w_.:]+(?![},]))$/);
    return wordMatch ? wordMatch[0] : "";
  }, [values.beforeCursor]);

@@ -119,9 +134,10 @@ const QueryEditorAutocomplete: FC<QueryEditorAutocompleteProps> = ({
    // Add quotes around the value if the context is labelValue
    if (context === QueryContextType.labelValue) {
      const quote = "\"";
-      const needsQuote = /(?:=|!=|=~|!~)$/.test(beforeValueByContext);
      valueAfterCursor = valueAfterCursor.replace(/^[^\s"|},]*/, "");
-      insert = `${needsQuote ? quote : ""}${insert}`;
+      const needsOpenQuote = /(?:=|!=|=~|!~)$/.test(beforeValueByContext);
+      const needsCloseQuote = valueAfterCursor.trim()[0] !== "\"";
+      insert = `${needsOpenQuote ? quote : ""}${insert}${needsCloseQuote ? quote : ""}`;
    }

    if (context === QueryContextType.label) {
--- a/app/vmui/packages/vmui/src/components/ExploreAnomaly/AnomalyConfig.tsx
+++ b/app/vmui/packages/vmui/src/components/ExploreAnomaly/AnomalyConfig.tsx
@@ -63,7 +63,7 @@ const AnomalyConfig: FC = () => {
    URL.revokeObjectURL(downloadUrl);
    setTextConfig("");
    setDownloadUrl("");
-    fetchConfig();
+    return fetchConfig();
  };

  return (
--- a/app/vmui/packages/vmui/src/components/Main/Icons/index.tsx
+++ b/app/vmui/packages/vmui/src/components/Main/Icons/index.tsx
@@ -520,3 +520,36 @@ export const DownloadIcon = () => (
    <path d="M19 9h-4V3H9v6H5l7 7 7-7zM5 18v2h14v-2H5z"></path>
  </svg>
 );
+
+export const ExpandIcon = () => (
+  <svg
+    viewBox="0 0 24 24"
+    fill="currentColor"
+  >
+    <path
+      d="M12 5.83 15.17 9l1.41-1.41L12 3 7.41 7.59 8.83 9zm0 12.34L8.83 15l-1.41 1.41L12 21l4.59-4.59L15.17 15z"
+    ></path>
+  </svg>
+);
+
+export const CollapseIcon = () => (
+  <svg
+    viewBox="0 0 24 24"
+    fill="currentColor"
+  >
+    <path
+      d="M7.41 18.59 8.83 20 12 16.83 15.17 20l1.41-1.41L12 14zm9.18-13.18L15.17 4 12 7.17 8.83 4 7.41 5.41 12 10z"
+    ></path>
+  </svg>
+);
+
+export const SearchIcon = () => (
+  <svg
+    viewBox="0 0 24 24"
+    fill="currentColor"
+  >
+    <path
+      d="M15.5 14h-.79l-.28-.27C15.41 12.59 16 11.11 16 9.5 16 5.91 13.09 3 9.5 3S3 5.91 3 9.5 5.91 16 9.5 16c1.61 0 3.09-.59 4.23-1.57l.27.28v.79l5 4.99L20.49 19zm-6 0C7.01 14 5 11.99 5 9.5S7.01 5 9.5 5 14 7.01 14 9.5 11.99 14 9.5 14"
+    ></path>
+  </svg>
+);
--- a/Show More
+++ b/Show More